input > 1
syntax tree: (1 () ())
result: 1

input > 2345
syntax tree: (2345 () ())
result: 2345

input > 123+456
syntax tree: (+ (123 () ()) (456 () ()))
result: 579

input > 123 456
syntax tree: (* (123 () ()) (456 () ()))
result: 56088

input > 456-123
syntax tree: (- (456 () ()) (123 () ()))
result: 333

input > 456/123
syntax tree: (152/41 () ())
result: 152/41

input > 123 +456
syntax tree: (+ (123 () ()) (456 () ()))
result: 579

input > 456 -123
syntax tree: (- (456 () ()) (123 () ()))
result: 333

input > 456 /123
syntax tree: (/ (456 () ()) (123 () ()))
result: 152/41

input > 123+ 456
syntax tree: (+ (123 () ()) (456 () ()))
result: 579

input > 456- 123
syntax tree: (- (456 () ()) (123 () ()))
result: 333

input > 456/ 123
syntax tree: (/ (456 () ()) (123 () ()))
result: 152/41

input > 123 + 456
syntax tree: (+ (123 () ()) (456 () ()))
result: 579

input > 456 - 123
syntax tree: (- (456 () ()) (123 () ()))
result: 333

input > 456 / 123
syntax tree: (/ (456 () ()) (123 () ()))
result: 152/41

input > 1 second
syntax tree: (* (1 () ()) (1 (second) ()))
result: 1 second

input > 1 minute
syntax tree: (* (1 () ()) (1 (minute) ()))
result: 60 second

input > 1 day
syntax tree: (* (1 () ()) (1 (day) ()))
result: 86400 second

input > 1 year
syntax tree: (* (1 () ()) (1 (year) ()))
result: 31536000 second

input > 1/second
syntax tree: (/ (1 () ()) (1 (second) ()))
result: 1 / second

input > 1 /second
syntax tree: (/ (1 () ()) (1 (second) ()))
result: 1 / second

input > 1/ second
syntax tree: (/ (1 () ()) (1 (second) ()))
result: 1 / second

input > 1/2 second
syntax tree: (* (1/2 () ()) (1 (second) ()))
result: 1/2 second

input > 1 light_year / meter / 9406910000000000
syntax tree: (/ (/ (* (1 () ()) (1 (light_year) ())) (1 (meter) ())) (9406910000000000 () ()))
result: 1

input > 3 mile/hour / (meter/second) / 1.3410957716640002
syntax tree: (/ (/ (/ (* (3 () ()) (1 (mile) ())) (1 (hour) ())) (/ (1 (meter) ()) (1 (second) ()))) (1.3410957716640002 () ()))
result: 1.0

input > 50 kg / (meter meter) / (pound/(inch inch)) / 0.07111414700544476
syntax tree: (/ (/ (/ (* (50 () ()) (1 (kg) ())) (* (1 (meter) ()) (1 (meter) ()))) (/ (1 (pound) ()) (* (1 (inch) ()) (1 (inch) ())))) (0.07111414700544476 () ()))
result: 1.0

input > 2 second + 3 second
syntax tree: (+ (* (2 () ()) (1 (second) ())) (* (3 () ()) (1 (second) ())))
result: 5 second

input > 3 second - 2 second
syntax tree: (- (* (3 () ()) (1 (second) ())) (* (2 () ()) (1 (second) ())))
result: 1 second

input > 5 meter/second + 4 meter/second
syntax tree: (+ (/ (* (5 () ()) (1 (meter) ())) (1 (second) ())) (/ (* (4 () ()) (1 (meter) ())) (1 (second) ())))
result: 9 meter / second

input > 5 meter/second - 4 meter/second
syntax tree: (- (/ (* (5 () ()) (1 (meter) ())) (1 (second) ())) (/ (* (4 () ()) (1 (meter) ())) (1 (second) ())))
result: 1 meter / second

input > 3 5 meter/second
syntax tree: (/ (* (* (3 () ()) (5 () ())) (1 (meter) ())) (1 (second) ()))
result: 15 meter / second

input > 4 second 5 meter/second
syntax tree: (/ (* (* (* (4 () ()) (1 (second) ())) (5 () ())) (1 (meter) ())) (1 (second) ()))
result: 20 meter

input > (4 meter + 5 meter) / second
syntax tree: (/ (+ (* (4 () ()) (1 (meter) ())) (* (5 () ()) (1 (meter) ()))) (1 (second) ()))
result: 9 meter / second

input > (4 meter + 5 meter) / (3 second)
syntax tree: (/ (+ (* (4 () ()) (1 (meter) ())) (* (5 () ()) (1 (meter) ()))) (* (3 () ()) (1 (second) ())))
result: 3 meter / second

input > 4 meter / (3 second - 1 second)
syntax tree: (/ (* (4 () ()) (1 (meter) ())) (- (* (3 () ()) (1 (second) ())) (* (1 () ()) (1 (second) ()))))
result: 2 meter / second

input > (3 acre foot / hour + 2 liter / minute) / (271.5516633551994 gallon / second)
syntax tree: (/ (+ (/ (* (* (3 () ()) (1 (acre) ())) (1 (foot) ())) (1 (hour) ())) (/ (* (2 () ()) (1 (liter) ())) (1 (minute) ()))) (/ (* (271.5516633551994 () ()) (1 (gallon) ())) (1 (second) ())))
result: 1.0

input > c/(mile/second) / 186285.762442867
syntax tree: (/ (/ (1 (c) ()) (/ (1 (mile) ()) (1 (second) ()))) (186285.762442867 () ()))
result: 1.0

input > $x = 123
syntax tree: (define x (123 () ()))
result: $x = 123

input > $y = 456
syntax tree: (define y (456 () ()))
result: $y = 456

input > $z = 789
syntax tree: (define z (789 () ()))
result: $z = 789

input > $w = 3456
syntax tree: (define w (3456 () ()))
result: $w = 3456

input > $x + $y
syntax tree: (+ x y)
result: 579

input > $x+ $y
syntax tree: (+ x y)
result: 579

input > $x +$y
syntax tree: (+ x y)
result: 579

input > $x + $y + $z
syntax tree: (+ (+ x y) z)
result: 1368

input > $x +$y+ $z
syntax tree: (+ (+ x y) z)
result: 1368

input > $x + $y + $z + $w
syntax tree: (+ (+ (+ x y) z) w)
result: 4824

input > $x $y
syntax tree: (* x y)
result: 56088

input > $x $y $z
syntax tree: (* (* x y) z)
result: 44253432

input > $x $y $z $w
syntax tree: (* (* (* x y) z) w)
result: 152939860992

input > $x - $y
syntax tree: (- x y)
result: -333

input > $x- $y
syntax tree: (- x y)
result: -333

input > $x -$y
syntax tree: (- x y)
result: -333

input > $x - $y - $z
syntax tree: (- (- x y) z)
result: -1122

input > $x -$y- $z
syntax tree: (- (- x y) z)
result: -1122

input > $x - $y - $z - $w
syntax tree: (- (- (- x y) z) w)
result: -4578

input > $x + $y $z + $w
syntax tree: (+ (+ x (* y z)) w)
result: 363363

input > $x $y + $z $w
syntax tree: (+ (* x y) (* z w))
result: 2782872

input > $x / $y
syntax tree: (/ x y)
result: 41/152

input > $x/ $y
syntax tree: (/ x y)
result: 41/152

input > $x /$y
syntax tree: (/ x y)
result: 41/152

input > $x $y / $z $w
syntax tree: (* (/ (* x y) z) w)
result: 64613376/263

input > $x / $y $z $w
syntax tree: (* (* (/ x y) z) w)
result: 13974768/19

input > $x $y $z / $w
syntax tree: (/ (* (* x y) z) w)
result: 204877/16

input > $ans = 31458 / 749
syntax tree: (define ans (/ (31458 () ()) (749 () ())))
result: $ans = 42