C :

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

C++ :

#include<iostream>
using namespace std;
int main(){
	int a,b;
	cin>>a>>b;
	cout<<a+b<<endl;
}

Java :

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