import sys
reader = (s.rstrip() for s in sys.stdin)
input = reader.__next__


from bisect import bisect_left

n,m,k = map(int, input().split())
op, *B = input().split()
B = list(map(int, B))
A = [int(input()) for i in range(n)]

B.sort()
ans = 0
for ai in A:
    if op == "+":
        target = k-ai
    else:
        target = -(-k//ai)
    ans += m - bisect_left(B, target)
print(ans)