HDU 1049

#include<stdio.h>int main(){    int n,u,d,t,s;    while(~scanf("%d%d%d",&n,&u,&d)&&n+u+d)    {        s = t = 0;        while(s<n)        {            t++;            s += u;            if(s>=n)                break ;            s -= d;            t++;        }        printf("%d\n",t);    }    return 0;}