#include<bits/stdc++.h>
using namespace std;
int n;
int main(){
    cin>>n;
    if(n<10) cout<<n*1.5;
    else cout<<n*1.2;
	return 0;       
}
/**************************************************************
	Problem: 1630
	User: zhangziang
	Language: C++
	Result: Wrong Answer
****************************************************************/