limit = 2000
distinct_prime_factor_count = [0]*(limit+1)
primes = []
for i in range(2, limit+1):
    if distinct_prime_factor_count[i] == 0:
        primes.append(i)
        for num in range(i, limit+1, i):
            distinct_prime_factor_count[num] += 1

M, D = input().split()
N = int(M + D.zfill(2))

if N in primes:
    print('Yes')
else:
    print('No')