#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
int main() {
	long n;
	cin >> n;
	int co = 0;
	while (n != 0) {
		n /= 2;
		co++;
	}
	cout << co << endl;
}