// 解説見て書いただけ

/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.06.08 16:52:59
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

ll f(int t) {
    ll s = 0;
    while(t) {
        s += t;
        t >>= 1;
    }
    return s;
}
int main() {
    int n;cin >> n;
    int l = -1,r = 1000000001;
    while(r - l > 1) {
        int mid = l + (r - l) / 2;
        if (f(mid) >= n) {
            r = mid;
        }
        else {
            l = mid;
        }
    }
    if (f(r) == n) {
        puts("YES");
    }
    else {
        puts("NO");
    }
    return 0;
}