#include <bits/stdc++.h>

using namespace std;

using ll = long long;

ll calc(int x) {
    ll res = 0;
    while (x > 0) {
        res += x;
        x >>= 1;
    }
    return res;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    int ok = 0, ng = n + 1;
    while (ng - ok > 1) {
        int mid = (ok + ng) / 2;
        if (calc(mid) <= n) ok = mid;
        else ng = mid;
    }
    cout << (calc(ok) == n ? "YES" : "NO") << endl;
    return 0;
}