#include <fstream>
#include <iostream>

using namespace std;

int main() 
{
 
    int n;
    int kiek=0;
    cin>>n;
    while(n!=0){
        if (n%2==1) n=n-1;
        else n=n/2;
        kiek++;
    }
    cout<<kiek;

return 0;
}