#include<stdio..h>
#include<math.h>
int main()
{
    int usd;
    double euro;
    const double con;
    scanf("%d",&usd);
    if(usd<0)
    {
        printf("Invalid input");
    }
    else
    {
        euro=usd*con;
        euro=round(euro*100.0)/100.0;
        printf("%.2f",euro);
    }
}