poj2521---lose money

    #include <stdio.h>

    #include <stdlib.h>



    int rever(int n)

    {

            return -n;

    }





    int main()

    {

        int n,m,p,c;

        while(scanf("%d %d %d %d",&n,&m,&p,&c) !=EOF && n && m && p && c)

        {

            printf("%d\n",rever(m-p-n));

        }

        return 0;

    }

View Code