#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
void solve() {
ll n, m;
ll a = 0;
cin >> n >> m;
if (n == 1) {
cout << "1";
return;
}
if (m <= n / 2) {
a = m + 1;
} else {
a = m - 1;
}
cout << a;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
solve();
return 0;
}
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