A convenience store has four kinds of sandwiches, and three kinds of triangular gimbap. In how many ways can you choose one sandwich and one gimbap?
4 1 [OP_COMB] 3 1 [OP_COMB] [OP_MUL]
var_a = 4
var_b = 1
var_c = 1
var_a = int(var_a)
var_b = int(var_b)
for i, elem in enumerate(range(var_b)):
    var_c = var_c * (var_a-i)
for i, elem in enumerate(range(var_b)):
    var_c = var_c / (i+1)
var_d = 3
var_e = 1
var_f = 1
var_d = int(var_d)
var_e = int(var_e)
for i, elem in enumerate(range(var_e)):
    var_f = var_f * (var_d-i)
for i, elem in enumerate(range(var_e)):
    var_f = var_f / (i+1)
var_g = var_c * var_f
print(int(var_g))