1783번 병든 나이트

#include <iostream>
#include <cmath>
#include <algorithm>
using namespace std;

int main() {

	int n, m;
	cin >> n >> m;

	if (n == 1) {
		cout << 1 << "\n";
	}
	else if (n == 2) {
		cout << min(4, (m + 1) / 2) << "\n";
	}
	else {
		if (m >= 7) {
			cout << m - 2 << "\n";
		}
		else {
			cout << min(4, m) << "\n";
		}
	}

	return 0;
}