n = int(input())
if n == 2:
    print("YES")
else:
    a = 0
    m = int(float(n)**0.5)
    for i in range(3, m, 2):
        if n % i == 0:
            a = 1
            break
    if a == 1:
        print("YES")
    else:
        if n % 2 == 1:
            print("YES")
        else:
            print("NO")