#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	float q;
	cin>>n;
	if (n<10){
		q=n*1.5;
	}
	else{
		q=n*1.2;
	}
	printf("%.1f",q);
	return 0;
}
/**************************************************************
	Problem: 1630
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/