#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (int)n; i++)
using ll = long long;

int main(){
  int n;
  cin >> n;
  int a[n+1];
  rep(i,n) cin >> a[i+1];
  int c = 0;
  for(int i = n; i > 0; i--) {
    if(a[i] > i or (a[i]+c) % i) {
      cout << "No" << endl;
      return 0;
    } 
    c += (a[i]+c)/i; 
  }
  cout << "Yes" << endl;
  return 0;
}