#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + 10;
int n, a, x;
int main() {
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a;
    x = x ^ a;
  }
  if (x == 0)
    cout << "yes";
  else
    cout << "no";
}
