#include <bits/stdc++.h>
using namespace std;
const int MM = 1000000000;
const int MOD = MM + 7;
const int MAX = 510000;
template <class T>
inline bool chmin(T& a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmax(T& a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
const long long INF = 1LL << 60;
const double pi = acos(-1.0);
int main() {
  long long n;
  cin >> n;
  map<long long, long long> s;
  for (long long i = 0; i < n; i++) {
    long long a;
    cin >> a;
    s[a]++;
  }
  bool ans;
  if (s.size() > 3)
    ans = false;
  else if (s.size() == 3) {
    if (n % 3 == 0 && (*s.begin()).second == n / 3 &&
        (*s.begin()++).second == n / 3)
      ans = true;
    else
      ans = false;
  } else if (s.size() == 2) {
    if (n % 3 == 0 && (*s.begin()).first == 0 && (*s.begin()).second == n / 3)
      ans = true;
    else
      ans = false;
  } else if (s.count(0))
    ans = true;
  else
    ans = false;
  cout << (ans ? "Yes" : "No") << endl;
}
