import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)


def F(t):
    res = 0
    while t:
        res += t
        t >>= 1
    return res


N = int(input())
l = 0
r = 10 ** 9
while r - l > 1:
    m = (r + l) // 2
    if F(m) > N:
        r = m
    else:
        l = m

if F(l) == N:
    print("YES")
else:
    print("NO")