include <bits/stdc++.h>

using namespace std;

int main() {

double n;
cin>>n;
double m=0;
while(n!=0){
	int d=n+0.999999;
	if(d<=4)
	m=10;
	else if(d>4&&d<=8)
	m=10+(d-4)*2;
	else{
		int 
	}		
	cin>>n;
}
return 0;

}