There are 21 cookies in one bag and there are 4 bags of cookies in one box. If there are 2 cookie boxes, find how many cookies there are.
21 4 [OP_MUL] 2 [OP_MUL]
var_a = 21
var_b = 4
var_c = var_a * var_b
var_d = 2
var_e = var_c * var_d
print(int(var_e))