#include <bits/stdc++.h>
using namespace std;

int main()
{
	int n;
	cin >> n;
	int a = 1, ans = 0;
	while (1)
	{
		if (a * 2 <= n)
		{
			a *= 2;
		}
		else
		{
			a++;
		}
		ans++;
		if (a == n)
		{
			break;
		}
	}
	printf("%d", ans);
	return 0;
}

有没有大佬能帮我找出这份代码的错误