HOJ ( acm.hdu.edu.cn ) 1049

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