There are 4 boxes of 6 ballpoint pens. If you pack 3 ballpoint pens in a box, how many boxes are needed?
6 4 [OP_MUL] 3 [OP_DIV]
var_a = 6
var_b = 4
var_c = var_a * var_b
var_d = 3
var_e = var_c / var_d
print(int(var_e))