#include<stdio.h>
using namespace std;
int main()
{
int n,a,b;
float x;
scanf("%d",&n);
printf("%d",n);
printf("\n");
a=n+8;
printf("%d",a);
printf("\n");
b=a-2;
printf("%d",b);
printf("\n");
x=(n+a+b)*1.0/3;
printf("%.1f",x);
}