#約数全部
def Divisors(N):
    N=abs(N)
    L,U=[],[]
    k=1
    while k*k <=N:
        if N%k== 0:
            L.append(k)
            if k!=N//k:
                U.append(N//k)
        k+=1
    return L+U[::-1]

A=int(input())
D=Divisors(2*A)

F=0
for n in D:
    if n<=2:
        continue

    if ((2*A)//n-n+1)&1:
        continue

    m=((2*A)//n-n+1)//2
    if m>=1:
        F=1
        break

if F:
    print("YES")
else:
    print("NO")