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

int main(){
    int n;
    cin>>n;
	double r;
	if(n < 10){
		r = n * 1.5;
	}else{
		r = n * 1.2;
	}
	
	cout<<fixed<<setprecision(1)<<r;
}
 

/**************************************************************
	Problem: 1630
	User: admin
	Language: C++
	Result: Accepted
	Time:26 ms
	Memory:2072 kb
****************************************************************/