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