#include <iostream>
#include <cmath>
#include <cstdio>
using namespace std;
int Count(int x) {
    return log2(x)+1;
}
int main() {
//  freopen("H:\\命题\\0 网站\\1\\Test\\Input\\input4.txt","r",stdin);
//  freopen("H:\\命题\\0 网站\\1\\Test\\Output\\output4.txt","w",stdout);
    int x;
    cin>>x;
    cout<<Count(x)<<endl;
    return 0;
}
//我是小牛逼，越来越牛逼！