题解 | #牛牛的素数和#

def is_prime(num):
    if num < 2 :
        return False
    for i in range(2,num):
        if num % i == 0:
            return False
    return True

def prime_sum_and_list(l,r):
    prime_sum = 0
    prime_list = []
    for item in range(l,r+1):
        if is_prime(item):
            prime_sum += item
            prime_list.append(item)

    return prime_sum,prime_list

a,b = map(int,input().split())
prime_sum, prime_list = prime_sum_and_list(a, b)
print(prime_sum)
# print(prime_list)