#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
int sum[200020] = { 0 };
int a[200020];
int main() {
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	for (int i = n; i > 0; i--) {
		if (a[i] != 0) {
			sum[i]++;
			sum[i] += sum[i + 1];
		}
	}
	for (int i = 1; i <= n; i++) {
		if ((sum[i + 1] + a[i]) % i != 0) {
			cout << "No" << endl;
			return 0;
		}
	}
	cout << "Yes" << endl;
	return 0;
}