#include <cmath>
#include <string>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
	int N, K;
	cin >> N >> K;
	if (N == 2) {
		cout << (K == 1 ? 2 : 1) << endl;
	}
	else {
		if (2 * K - 1 <= N) {
			cout << N - 1 << endl;
		}
		else {
			cout << (K != N ? N : N - 1) << endl;
		}
	}
	return 0;
}