#include <bits/stdc++.h>

using namespace std;

int main()
{
  long long num, count = 0, bis = 1;
  cin >> num;

  while(1)
  {
    long long los = num - bis;

    if (los > bis * 2)
    {
      bis = bis * 2;
      count++;
    }
    else
    {
      if (los % 2 == 0)
      {
        cout << count + 1 << endl;
        exit(0);
      }
      else
      {
        cout << count + 2 << endl;
        exit(0);
      }
    }
  }
}