#include <iostream>
#include <iomanip>
#include <algorithm>

using namespace std;

int main(){
	int n, l, r, s;
	cin >> n >> l >> r;
	if (r - l + l % n >= n - 1){
		s = n - 1;
	}
	else{
		s = r % n;
	}
	cout << s << endl;
	return 0;
}