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