def main():
    import sys
    from bisect import bisect_left
    input = sys.stdin.readline

    N, M, K = map(int, input().split())
    line = input().split()
    op = line[0]
    B = list(map(int, line[1:]))
    A = [0] * N
    for i in range(N):
        A[i] = int(input())
    A.sort()
    B.sort()

    ans = 0
    if op == '+':
        for a in A:
            i = bisect_left(B, K-a)
            ans += M - i
    else:
        for a in A:
            i = bisect_left(B, (K-1)//a + 1)
            ans += M - i
    print(ans)


if __name__ == '__main__':
    main()