#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;

int main() {
  int n;
  cin >> n;
  vector<ll> a(n);
  rep(i,n) cin >> a[i];
  int ok = 1;
  ll add = 0;
  for (int i = n - 1; i >= 0; i--) {
    if (a[i] <= i + 1 && (a[i] + add) % (i + 1) == 0) add += (a[i] + add) / (i + 1);
    else ok = 0;
  }

  cout << (ok ? "Yes" : "No") << endl;
  return 0;
}