Each pack of dolls contains 12 dolls. How many dolls are left if 11 students took 3 dolls each from 3 packs of dolls?
12 3 [OP_MUL] 11 3 [OP_MUL] [OP_SUB]
var_a = 12
var_b = 3
var_c = var_a * var_b
var_d = 11
var_e = 3
var_f = var_d * var_e
var_g = var_c - var_f
print(int(var_g))