rt

[提交记录]https://www.luogu.com.cn/record/134032392

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