#include<stdio.h>

void main(){
	int n;
	double p;
	scanf("%d",&n);
	
	if(n<10&&n>0){
		p=n*1.5;
	}else if(n>=10){
		p=n*1.2;
	}
	printf("%.1f",p);
}
/**************************************************************
	Problem: 1630
	User: admin
	Language: C
	Result: Accepted
	Time:16 ms
	Memory:1144 kb
****************************************************************/