C :

#include<stdio.h>
int main()
{
	int a;
	scanf("%d",&a);
	printf("%d",a);
	return 0;
}

C++ :

#include<stdio.h>
#include<math.h>
int main()
{
	int a;
	scanf("%d",&a);
	printf("%d",a);
	return 0;
}

Java :

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		System.out.println(a);
	}
}

Python :

# coding=utf-8
#python2
a=int(input())
print a,'\n'

C# :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    internal class Program
    {
        static void Main()
        {

            string a = Console.ReadLine();
 
            Console.WriteLine(a);

            Console.ReadKey();

        }

    }
}