#include <bits/stdc++.h>   using namespace std;   int main() {     long long n, k;     bool odd = false, even = false;     cin >> n >> k;     if (n & 1) {       if (k > (n / 2 + 1)) {         even = true;         k -= (n / 2 + 1);       } else         odd = true;     } else {       if (k > n / 2) {         even = true;         k -= (n / 2);       } else         odd = true;     }     if (odd)       cout << 2 * k - 1 << endl;     else       cout << 2 * k << endl;     return 0;   }   