#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <math.h>
using namespace std;

int main() {
    int n,test = 1,ans = 0;
    cin >> n;
    while(1){
        if(test >= n)break;
        test *= 2;
        ans++;
    }
    cout << ans << endl;
    return 0;
}