from bisect import bisect_right

n, m, k = map(int, input().split())
B = list(input().split())
op = B[0]
B = list(map(int, B[1:]))
A = [int(input()) for _ in range(n)]

A.sort()
B.sort()
ans = 0
for i in range(n):
    if op == '+':
        res = k - A[i] - 1
    elif op == '*':
        res = k // A[i]
        if k % A[i] == 0:
            res -= 1
    cnt = bisect_right(B, res)
    ans += cnt
print(n * m - ans)