import java.util.Scanner;

public class Test {
	public static Scanner sc = new Scanner(System.in);

	public static void main(String[] args) {
		long[] m = new long[10];
		long n = sc.nextLong();
		for(int i = 1; i < 10; i++){
			m[i] = n % 100;
			n /= 100;
		}
		for(int i = 1; i < 10; i++){
			m[i-1] += m[i]*8;
			m[i] += m[i-1]/100;
			m[i-1] %= 100;
		}
		long a = 0;
		for(int i = 9; i > 0; i--){
			a *= 100;
			a += m[i];
		}
		System.out.print(a);
		if(m[0] > 0){
			System.out.printf(".%02d",m[0]);
		}
		System.out.println();
	}
}