#include <iostream>

using namespace std;

int main()
{
    int a, b, k=0;

    cin>>a;

    if(a==0)
        cout<<"1";
    else
    {
    while(a)
    {
        b=a/2;
        a=b;
        k++;
    }

    cout<<k;
    }
    return 0;
}