A carton of milk weighed eight kilograms (kg). After using half the milk, I weighed it again and it was 5 kilograms (kg). How many kilograms (kg) does an empty milk carton weigh?
8 8 5 [OP_SUB] 1 [OP_MUL] 1/2 [OP_DIV] [OP_SUB]
var_a = 8
var_b = 8
var_c = 5
var_d = var_b - var_c
var_e = 1
var_f = var_d * var_e
var_g = 0.5
var_h = var_f / var_g
var_i = var_a - var_h
print(int(var_i))