C :

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

C++ :

#include <iostream>
using namespace std;
int main() {
    int a,b;
    while (cin >> a >> b) {
        cout << a+b << endl;
    }
	return 0;
}

Python :

# coding=utf-8
i = 1
while i != 0:
    a, b= map(int,input().split())
    print(a + b)