#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
//using namespace atcoder;
#define rep(i,a,n) for (int i = a; i < (n); i++)
#define all(x) (x).begin(),(x).end()
using ll = long long;
using P = pair<int,int>;
using Graph = vector<vector<int>>;
int mod = 998244353;
int INF = 1001001001;
using pll = pair<int,int>;

int Flag=0;

//デフォルトでNoがでる
void yn(int Flag){
  if(Flag==1){
    cout<<"Yes"<<endl;
  }
  else if(Flag==0){
    cout<<"No"<<endl;
  }
  else{
    cout<<"Draw"<<endl;
  }
}


int main(){
  int N; cin>>N;
  int cnt=0;
  int num=1;
  while(num<N){
    num*=2;
    cnt++;
  }
  cout<<cnt<<endl;
}