#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int n, k;
  cin >> n >> k;
  long long int res = 1;
  if (k == 1) {
    cout << n;
  } else {
    while (res <= n) res = (long long)(res * 2);
    cout << res - 1;
  }
  return 0;
}
