HOJ 2869 Soda Surpler

http://acm.hit.edu.cn/hoj/problem/view?id=2869

一个人有e＋f个空瓶子

c个空瓶子可以换一瓶苏打水

求这个人可以喝几瓶苏打水

喝过的瓶子可以再换

#include <stdio.h>

int main()
{
    int e, f, c, remain, sum;
    
    while (scanf("%d %d %d", &e, &f, &c) != EOF)
    {
        sum = 0;
        remain = e + f;
        while (remain >= c)
        {
            sum += remain / c;
            remain = remain / c + remain % c;
        }
        printf("%d\n", sum);
    }
    
    return 0;
}