I plan to sell 254 erasers by packing 30 in each box. How many more erasers would you need to pack and sell if there should be no leftover erasers?
30 254 30 [OP_MOD] [OP_SUB]
var_a = 30
var_b = 254
var_c = 30
var_d = var_b % var_c
var_e = var_a - var_d
print(int(var_e))