第9个测试点TLE了，大佬帮忙看看

#include <iostream>
using namespace std;
int main() {
	long long n, l, r, max = 0;
	cin >> n >> l >> r;
	for (long long i = l; i <= r; i++) {
		if (i % n > max) {
			max = i % n;
		}
		if (max == n - 1) {
			break;
		}
	}
	cout << max << endl;
	return 0;
}