import bisect


n, m, k = list(map(int, input().split()))
op = list(input().split())
b = [int(op[i]) for i in range(1, m + 1)]
a = [int(input()) for i in range(n)]

a = sorted(a)
ans = 0
if op[0] == "+":
    for num in b:
        ans += n - bisect.bisect_left(a, k - num)
else:
    for num in b:
        ans += n - bisect.bisect_left(a, -((-k) // num))
print(ans)