#include <bits/stdc++.h>
using namespace std;
using LL = long long;

LL n, s;

int main() {
	cin >> n;
	for (LL i = 1; i * i <= n; ++i) {
		if (n % i == 0) s += i, s += n / i;
		if (s > 2 * n) break;
	}
	puts(s == 2 * n ? "Yes" : "No");
	return 0;
}