There are 950 stones. If there are 150 more white stones than black stones, how many black stones are there?
950 150 [OP_SUB] 2 [OP_DIV]
var_a = 950
var_b = 150
var_c = var_a - var_b
var_d = 2
var_e = var_c / var_d
print(int(var_e))