using System;

class Program {
    static void Main() {
        int n = int.Parse(Console.ReadLine());
        int biscuits = 1;
        int ans = 0;
        while ((biscuits *= 2) < n) {
            ans++;
        }
        if (biscuits / 2 == n) {
            Console.WriteLine(ans);
        } else {
            Console.WriteLine(ans + 1);
        }
    }
}