#include<iostream>
using namespace std;
int main()
{
	int cnt, goal;
	cnt = 0;
	cin >> goal;
	if((goal%2) == 1 && goal != 1){
		goal--;
		cnt++;
	}
	for(int num=1;num<goal;cnt++){
		num = num*2;
	}
	cout << cnt << endl;
    return 0;
}