def main():
    alist = []
    for _ in range(int(input())):
        alist.append(int(input()))
    
    def is_prime(n):
        if n<=1:
            return False
        for i in range(2, n):
            if n % i == 0:
                return False
        return True
    
    result = sum(is_prime(n) for n in alist)
    print(result)

main()
