#include<bits/stdc++.h>
using namespace std;
int main(){
	int a1;
	float a2,a3;
	cin>>a1;
	if(a1<10){
		a2=1.5;
		a3=a1*1.5;
		printf("%.1f",a3);
	}else{
		a2=1.2;
		a3=a1*1.2;
		printf("%.1f",a3);
	}
}
/**************************************************************
	Problem: 1630
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/