C :

#include<stdio.h>
int main()
{
	int a,b,c;
	scanf("%d",&a);
	printf("%d\n",a);
	printf("%d\n",a+8);
	printf("%d\n",a+6);
	printf("%.1f",(3*a+14)*1.0/3);
	return 0;
}

C++ :

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	cout<<n<<endl;
	cout<<n+8<<endl;
	cout<<n+6<<endl;
	cout<<fixed<<setprecision(1)<<(n+n+8+n+6)/3.0<<endl;
    return 0;
}

Java :

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int y = n + 8;
		int b = y - 2;
		double p =(double) (n + y + b) /3;
		System.out.println(n);
		System.out.println(y);
		System.out.println(b);
		System.out.println(String.format("%.1f", p));
	}
}

Python :

a=int(input())
b=a+8
c=b-2
print(a)
print(b)
print(c)
print("%.1lf"%((a+b+c)/3))