#include <iostream>

using namespace std;

int main(){
  int N, nowcookie = 1, ans = 0;

  cin >> N;

  if(N == 1){
    cout << 0;
    return 0;
  }

  while(1){
    if(nowcookie * 2 >= N){
      ans++;
      cout << ans << endl;
      break;
    } else if (nowcookie * 2 < N){
      nowcookie *= 2;
      ans++;
    }
  }

  return 0;
}