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

C++:  
#include <iostream>
using namespace std;  
int main() 
{
	int a;
	cin>>a;
 	cout<<a;
 	return 0;
}

Python:
a=int(input())
print(a)

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