#include <bits/stdc++.h>
#define int int64_t
using namespace std;

int deg[50];

int32_t main(){
   deg[0] = 1;
   for(int i = 1; i < 50; i ++){
      deg[i] = deg[i-1] * 2;
   }
   ios_base::sync_with_stdio(0);
   int k;
   cin >> k;
   if(((int)(log2(k) * 100000) % 100000) == 0){
      cout << log2(k) + 1;
      return 0;
   }
   for(int i = 0; i < 49; i ++){
      if((k - deg[i]) % deg[i+1] == 0){
         cout << i + 1;
         return 0;
      }
   }

}