#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int main() {
  ll N;
  scanf("%lld", &N);

  ll x = 1;
  ll ans = 0;
  while (x < N) {
    x *= 2;
    ans++;
  }
  ans += x - N;;
  printf("%lld\n", ans);
  return 0;
}