#include <iostream>

using namespace std;

int main()
{
    int N, nrBiti = 0;
    cin >> N;
    
    if(N==0)
        nrBiti = 1;
    while(N)
    {
        N = N / 2;
        nrBiti++;
    }
   cout << nrBiti << endl; 
   
   return 0;
}