#include<bits/stdc++.h>
using namespace std;
int main(){
	freopen("candy.in","r",stdin);
	freopen("candy.out","w",stdout);
	int n,l,r,t;
	cin>>n>>l>>r;
	t=l%n;
	if(t+(r-l)>=n-1){
		cout<<n-1;
	}
	else{
		cout<<r%n;
	}
	return 0;
}