#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;
using mint = modint998244353;

int main() {
  int N, K; cin >> N >> K;
  cout << (N == 1 ? 1: (K == N - 1 ? N: N - 1)) << endl;
  return 0;
}