Climbing Worm

http://acm.hdu.edu.cn/showproblem.php?pid=1049

#include <iostream>
using namespace std;
int main()
{
    int n,u,d,s,t;
    while (cin >> n >> u >> d)
    {
        if (n==0)
            return 0;
        else
        {
            s=0;
            t=0;
            while (s+u<n)
            {
                s+=u-d;
                t+=2;
            }
            t+=1;
            cout << t << endl;
        }
    }
    return 0;
}