#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,l,r,ans;
	cin>>n>>l>>r;
	ans=n;
	if(r-l<n)
	{
		while(ans<=r)
		{
			if(ans>r&&ans<l)
			{
				cout<<n-1;
				return 0;
			}
			ans+=ans;
		}
		cout<<r%n;
		return 0;
	}
	cout<<n-1;
	return 0;
}