1049 Climbing Worm

 #include<iostream>
using namespace std;
void main()
{
    float n,u,d;
    int t;
    while(cin>>n>>u>>d&&!((n==0)&&(u==0)&&(d==0)))
        {
           t=(int)((2.0*n-u-d)/(u-d)+0.5);
           t%2==0?cout<<t+1<<endl:cout<<t<<endl;
        }
}