Namjoon gave two strokes of a pencil he had to Yoongi, and he had 15 left. If one stroke is 12 pencils, how many pencils did Yoongi receive from Namjoon?
12 2 [OP_MUL] 15 [OP_SUB]
var_a = 12
var_b = 2
var_c = var_a * var_b
var_d = 15
var_e = var_c - var_d
print(int(var_e))