#include <iostream>
#include <stdio.h>
#include <string.h>
using namespace std;
typedef long long LL;
int main(int argc, char* argv[])
{
	LL D;
	cin>>D;
	LL d=D*100+8*D;
	char x[100];
	sprintf(x,"%lld",d);
	int len=strlen(x);
	for (int i=0;i<len;i++){
		if (i==len-2){
			cout<<".";
		}
		cout<<x[i];
	}
	cout<<endl;
	return 0;
}