#include <bits/stdc++.h>
using namespace std;

int main() {
  long long int n, a = 0, i = 0;

  cin >> n;
  while (1) {
    if (n == 1) {
      cout << i + a << endl;
      break;
    }
    if (n % 2 == 1) {
      n = (n - 1) / 2;
      i++;
      a = 1;
    } else {
      n = n / 2;
      i++;
    }
  }
}