A square was created by arranging 10 square-shaped ttakjis for each vertical and horizontal line without gaps. Find the number of ttakjis placed at the perimeter.
10 4 [OP_MUL] 4 [OP_SUB]
var_a = 10
var_b = 4
var_c = var_a * var_b
var_d = 4
var_e = var_c - var_d
print(int(var_e))