#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;
}
}
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;
}
}