#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void printL(auto a){
  cout << a << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

void jud(int i, int v, int N){
  if(N <= v*2+1){
    if(N%2 == 0) printL(i+1);
    else printL(i+2);
    return;
  }
  jud(i+1, v*2, N);
}

int main(){
  int N; cin >> N;
  jud(0, 1, N);
}