#include <iostream>

using namespace std;

int main(){
	int N;
	int sum = 1, cnt=0;

	cin >> N;

	while(1){
		if(sum*2 < N){
			cnt++;
			sum *= 2;
		}else{
			break;
		}
	}
	cout << cnt+1 << endl;

	return 0;
}