from bisect import bisect_left
from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    N, M, K = map(int, input().split())
    B = input().split()
    A = [int(input()) for _ in [0] * N]

    b = sorted(map(int, B[1:]))
    A.sort()
    ans = 0
    if B[0] == '+':
        for a in A:
            ans += M - bisect_left(b, K - a)
    else:
        for a in A:
            ans += M - bisect_left(b, K / a)
    print(ans)


main()