from bisect import bisect_left
N,M,K = map(int,input().split())
op, *B = input().split()
B = sorted([int(s) for s in B])
A = [int(input()) for _ in range(N)]

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