Namjoon has 3 sets of 7 marbles. He is going to make these marbles into 6 groups of 6 each. How many more marbles does he need?
6 6 [OP_MUL] 7 3 [OP_MUL] [OP_SUB]
var_a = 6
var_b = 6
var_c = var_a * var_b
var_d = 7
var_e = 3
var_f = var_d * var_e
var_g = var_c - var_f
print(int(var_g))