90分1WA求调！！！

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