#include<iostream>
using namespace std;
int main(){
    int a = 0;
    int n = 0;
    int b = 0;
    cin>>a;
    while(1)
    {
      n++;
      if(a%2 == 0)
      {
          a = a/2;
      }
      else
      {
          a = a/2+1;
      }
      if(a == 1)
      {
        return 0;
      }
    }
    cout<<n<<endl;
    system("pause");
    return 0;
}