80分求调

#include<bits/stdc++.h>
using namespace std;
int main() {
	int a, ans = 0;
	cin >> a;
	if (a == 1) {
		cout << 0;
		return 0;
	}
	while (a > 1) {
		a /= 2;
		ans++;
	}
	cout << ans + 1;
	return 0;
}