https://www.acmicpc.net/problem/10951
#include <iostream>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int A, B;
while (1) {
cin >> A >> B;
if (cin.eof() == 1) break;
cout << A + B << "\n";
}
return 0;
}