Some cookies come in bundles of 9 in a box, and there are 7 cookies in each bundle. If there are 13 boxes of these cookies, how many cookies are there?
13 9 [OP_MUL] 7 [OP_MUL]
var_a = 13
var_b = 9
var_c = var_a * var_b
var_d = 7
var_e = var_c * var_d
print(int(var_e))