Problem p03219 (C++)

Buggy submission (status: Runtime Error):
/*
                    !!!!!!
                    !!!!!!!!!!
                     !!!!!!!!!!!!!!!
                       !!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!
                      !!!!!!!!!!!!
                      !!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!
                        !!!!!!!!!!
                       !!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!                                  !!!!!
                  !!!!!!!!!!!!!!!!!!!                               !!!!!!!!!!
                 !!!!!!!!!!!!!!!!!!!!!!!                 !         !!!!!!!!!!
            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!              !!     !!!!!!!!!!!!
           !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!      !!!!!!!!
            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
             !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!
              !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  !!!!!!!!!!!!
       !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!!!!!
      !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!      !!!!!
          !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!!
        !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !
          !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
           !!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!
                   !!!!!!!!!!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!!
                      !!!!!!!!!!!!!!!!
                      !!!!!!!!!!!!!!!
                       !!!!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!!!!!
                          !!!!!!!!
                          !!!!!!
                           !!!!
*/
#include <bits/stdc++.h>
#define MAXN 100005
using namespace std;
/*
 *	author	:  vivekcrux
 */
typedef long long ll;
typedef pair<ll, ll> pll;

int main() {
  freopen("input.txt", "r", stdin);

  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  ll x, y;
  cin >> x >> y;
  cout << (x + y / 2);

  return 0;
}

Fixed submission:
/*
                    !!!!!!
                    !!!!!!!!!!
                     !!!!!!!!!!!!!!!
                       !!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!
                      !!!!!!!!!!!!
                      !!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!
                        !!!!!!!!!!
                       !!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!                                  !!!!!
                  !!!!!!!!!!!!!!!!!!!                               !!!!!!!!!!
                 !!!!!!!!!!!!!!!!!!!!!!!                 !         !!!!!!!!!!
            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!              !!     !!!!!!!!!!!!
           !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!      !!!!!!!!
            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
             !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!
              !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  !!!!!!!!!!!!
       !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!!!!!
      !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!      !!!!!
          !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!!
        !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !
          !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
           !!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!
                   !!!!!!!!!!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!!
                      !!!!!!!!!!!!!!!!
                      !!!!!!!!!!!!!!!
                       !!!!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!!!!!
                          !!!!!!!!
                          !!!!!!
                           !!!!
*/
#include <bits/stdc++.h>
#define MAXN 100005
using namespace std;
/*
 *	author	:  vivekcrux
 */
typedef long long ll;
typedef pair<ll, ll> pll;

int main() {
  // freopen("input.txt","r",stdin);

  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  ll x, y;
  cin >> x >> y;
  cout << (x + y / 2);

  return 0;
}