#include <bits/stdc++.h>
using namespace std;
int n, b[1001];
int main() {
  cin >> n;
  for (int i = 2; i <= n; i++) {
    cin >> b[i];
  }
  if (n % 3 == 0) {
    cout << "Yes";
  } else
    cout << "No";
}
