MAX = 10000
is_prime = [False] * 2 + [True] * (MAX - 1)
for i in range(2, MAX + 1):
    if not is_prime[i]:
        continue
    for j in range(2, MAX // i + 1):
        is_prime[i * j] = False
M, D = map(int, input().split())
print("Yes" if is_prime[M * 100 + D] else "No")