#include<bits/stdc++.h>
using namespace std;
#define NUM 10000
int num[NUM];
int main(){
    int N; cin >> N;
    int sheets = 1;
    int cnt = 0;
    while(true){
        if(N == 1) break;
        sheets *= 2; cnt++;
        if(sheets >= N) break;
        
    }
    cout << cnt << endl;
    return 0;
}