from bisect import bisect_left
N, M, K = map(int, input().split())
op, *B = input().split()
B = sorted(int(x) for x in B)
ans = N * M
for a in (int(input()) for _ in range(N)):
    if op == '+':
        ans -= bisect_left(B, K - a)
    else:
        ans -= bisect_left(B, K / a)
print(ans)