#include <iostream>

#include <stack>

using namespace std;

int main()

{

	ios::sync_with_stdio(false);

	cin.tie(nullptr);

	cout.tie(nullptr);

	int n, in;

	while (cin >> n && n) {

		while (cin >> in && in) {

			bool success = true;

			stack<int> A, station;

			for (int i = n; i > 0; --i) A.emplace(i);

			for (int i = 0; i < n; ++i) {

				if (i) cin >> in;

				if (!station.empty() && station.top() == in) station.pop();

				else {

					while (!A.empty() && A.top() != in) station.emplace(A.top()), A.pop();

					if (A.empty()) success = false;

					else A.pop();

				}

			}

			cout << (success ? "Yes\n" : "No\n");

		}

		cout << "\n";

	}

	return 0;

}