HDU1049 Climbing Worm

#include <iostream>
#include <algorithm>
#include <stdio.h>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <ctime>
#include <ctype.h>


using namespace std;


int main()
{
    int n,u,d;
    while(scanf("%d%d%d",&n,&u,&d)&&n&&u&&d)
    {
        int res=n,t=1;
        res-=u;
        while(res)
        {
            if(t>=2)
            {
                res-=u;
                t++;
            }
            if(res<=0)
                break;
            res+=d;
            t++;
        }
        printf("%d\n",t);
    }
    return 0;
}