The stones are laid out in a tight, regular row to form a square with 5 stones at the sides. What is the number of stones laid out on the perimeter?
5 4 [OP_MUL] 4 [OP_SUB]
var_a = 5
var_b = 4
var_c = var_a * var_b
var_d = 4
var_e = var_c - var_d
print(int(var_e))