C :

/* a+b 错的没良心呀  */
#include<stdio.h>

int main()
  {
  long long a,b;
  	while(~scanf("%lld%lld\n",&a,&b))
      {
      printf("%lld\n",a+b);
}
  }

C++ :

#include<cstdio>
int main() {
  long long a, b;
  while(scanf("%lld%lld", &a, &b) != EOF) {
  	printf("%lld\n", a+b);
  }
  return 0;
}

Java :

import java.util.*;

public class Main{
	public static void main(String str[]){
    	Scanner cin=new Scanner(System.in);
      while(cin.hasNext()){
      	System.out.println(cin.nextLong()+cin.nextLong());
      }
    }
  
}

Python :

import sys
for a in sys.stdin:
  x,y=map(int,a.split())
  print x+y