#include <iostream>
#include <algorithm>
#include <iterator>
#include <vector>
#include <cassert>
 
using namespace std;
 
int main() {
 
  typedef int Number;
  typedef std::vector<Number> Vector;
 
  Vector numbers;
 
  copy(istream_iterator<Number>(cin),
       istream_iterator<Number>(),
       back_inserter<Vector>(numbers));
 
  // np. sumy w wierszu:
 
  assert(numbers.size() % 2 == 0);
 
  for (size_t i = 0; i < numbers.size(); i += 2) {
    cout << numbers[i] + numbers[i+1] << endl;
  }
 
  return 0;
}

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