import math

def SoE(x):
    if x < 2:
        return []
    
    l = [i for i in range(x + 1)]
    l[1] = 0
    
    for i in l:
        if i > math.sqrt(x):
            break
        if i == 0:
            continue
        for j in range(2 * i , x + 1, i):
            l[j] = 0
    
    return [i for i in l if i != 0]

N = int(input())
l = SoE(N)
if N == 1 or l[-1] == N:
    print("NO")
else:
    print("YES")