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