#include <bits/stdc++.h>
using namespace std;
long long a , b;
int main() {
while (cin >> a >> b) {
if (a == 0 && b == 0) {
break;
}
cout << a + b << endl;
}
return 0;
}

#include <bits/stdc++.h>
using namespace std;
long long a , b;
int main() {
while (cin >> a >> b) {
if (a == 0 && b == 0) {
break;
}
cout << a + b << endl;
}
return 0;
}