It is said that out of 1256 Go stones, there are 408 more white ones than black ones. Find the number of black Go stones.
1256 408 [OP_SUB] 2 [OP_DIV]
var_a = 1256
var_b = 408
var_c = var_a - var_b
var_d = 2
var_e = var_c / var_d
print(int(var_e))