SO WATERRRRRRRRRRRRRRRRR

#include<bits/stdc++.h>
using namespace std;
double s=1,n,v,h;
int main(){
	cin>>h;
	h*=2.8;
	for(int i=1;i<10;i++){
		if(h/2<0.5){
			cout<<i;
			return 0;
		}
		h/=2;
	}
}