#!/usr/bin/env python

import argparse


def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument("--increment", "-i", default=1, type=int)
    return parser.parse_args()


def main():
    args = parse_args()
    total = 0

    while True:
        message = "({}) > ".format(total)
        try:
            data = input(message)

            padding = (len(message) + len(data)) * " "
            print("\033[F" + padding, end="\r")

            if data.isnumeric():
                total += int(data)
            else:
                total += args.increment
        except KeyboardInterrupt:
            break

    print("\r" + str(total), padding)


if __name__ == "__main__":
    main()