#include <cmath>
#include <vector>
#include <iostream>
#include <algorithm>
#include <set>
#include <iomanip>
#include <numeric>
#include <queue>
#include <string>
#include <map>
#include <fstream>
#include <cassert>


int main() {
	int n; std::cin >> n;
	std::vector<int> cells(n);
	for (auto &c : cells) std::cin >> c;
	long long int removed{ 0 };
	for (auto i = n; i > 0; --i) {
		if (i < cells[i - 1]) {
			std::cout << "No\n"; return 0;
		}
		if ((cells[i - 1] + removed) % i != 0) {
			std::cout << "No\n"; return 0;
		}
		removed += (cells[i - 1] + removed) / i;
	}
	std::cout << "Yes\n";
}