N,M,K = map(int, input().split())
B = [i for i in input().split()]
op = B.pop(0)
A = [int(input()) for _ in range(N)]
for i in range(M):
    B[i] = int(B[i])

import bisect
A.sort()
B.sort()
if op == "+":
    ans = 0
    for a in A:
        ans += M - bisect.bisect_left(B, K-a)
else:
    ans = 0
    for a in A:
        ans += M - bisect.bisect_left(B, K/a)
print(ans)