#include <algorithm>
#include <cmath>
#include <cstdio>
#include <functional>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
using namespace std;
using ll = long long;
int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  for(int i = 0; i < n; i++) {
    cin >> a[i];
  }
  int tmp = 0;
  bool ok = true;
  for(int i = n - 1; i >= 0; i--) {
    if((a[i] + tmp) % (i + 1) != 0) {
      ok = false;
    }
    if(a[i] > 0) {
      tmp++;
    }
  }
  ok ? (cout << "Yes\n") : (cout << "No\n");
  return 0;
}