题解

import math

def is_prime(num):
    if num < 2:
        return False
    for i in range(2, int(math.sqrt(num)) + 1):
        if num % i == 0:
            return False
    return True
n, m = map(int, input().split())
cards = list(map(int, input().split()))
indices = list(map(int, input().split()))

total = 0
for idx in indices:
    num = cards[idx - 1]
    if is_prime(num):
        total += num

print(total)