For lunch, there are 5 kinds of Chinese food and 4 kinds of Japanese food, and for dinner, there are 3 kinds of Chinese food and 5 kinds of Japanese food. Find the number of ways to choose one menu for lunch and one for dinner.
5 4 [OP_ADD] 3 5 [OP_ADD] [OP_MUL]
var_a = 5
var_b = 4
var_c = var_a + var_b
var_d = 3
var_e = 5
var_f = var_d + var_e
var_g = var_c * var_f
print(int(var_g))