I took several coins of the same size and lined them up so that there were 8 coins on each side, making a square. If you place coins around the perimeter of this square to make a square with a side 1 greater, how many more coins are needed?
8 2 [OP_MUL] 1 [OP_ADD]
var_a = 8
var_b = 2
var_c = var_a * var_b
var_d = 1
var_e = var_c + var_d
print(int(var_e))