#include <cstdio>
#include <iostream>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <fstream>
 
#define rep( i, l, r ) for (int i = l; i <= r; i++)
#define down( i, l, r ) for (int i = l; i >= r; i--)
 
using namespace std;
 
int main()
{
int m;
scanf("%d",&m);
printf("%d\n",int(log2(m))+1);
return 0;
}