import sys, time, random from collections import deque, Counter, defaultdict input = lambda: sys.stdin.readline().rstrip() ii = lambda: int(input()) mi = lambda: map(int, input().split()) li = lambda: list(mi()) inf = 2 ** 61 - 1 mod = 998244353 import string n, m = mi() a = li() b = li() coupon = [0] * 101 for i in range(m): coupon[100 - b[i]] += 1 coupon[100] = inf tako = [deque() for _ in range(101)] takosum = [0] * 101 a.sort() ans = 0 for i in range(n): tako[0].appendleft(a[i]) takosum[0] += a[i] for j in range(101): if len(tako[j]) <= coupon[j]: break takosum[j] -= tako[j][-1] tako[j + 1].appendleft(tako[j].pop()) takosum[j + 1] += tako[j + 1][0] ans = 0 for i in range(101): ans += takosum[i] * i // 100 print(ans)