#include <bit>
#include <iostream>

using namespace std;

typedef unsigned long long ull;

// https://stackoverflow.com/a/29389440
int bit_length(ull x) {
    return (8 * sizeof x) - countl_zero(x);
}

int main() {
	ull n;
	cin >> n;
	cout << bit_length(n - 1) + 1 << endl;
}