#include <bits/stdc++.h>
using namespace std;

int main()
{
    int N;
    cin >> N;

    int ans = 0;
    long long num = 1;
    while (num * 2 <= N)
    {
        num *= 2;
        ans++;
    }
    if (num != N)
    {
        ans++;
    }
    cout << ans;
}