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