#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
ll N;


int main(){

    ll N;
    cin >> N;
    ll X = 1;
    ll ans = 0;
    while(X < N){
        X *= 2;
        ans++;
    }

    if(X == N){
        cout << ans << endl;
    }else{
        cout << ans + 1 << endl;
    }


}