#include<bits/stdc++.h>
using namespace std;
int main(){
	int x;
	float z;
	cin>>x;
	if(x>=10)z=x*1.2;
	else z=x*1.5;
	printf("%.1f",z);
	return 0;
}

/**************************************************************
	Problem: 1630
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/