from bisect import *
from math import ceil
N,M,K = map(int,input().split())
l = list(map(str,input().split()))
op = l[0]
B = [0]*M
for i in range(1,M+1):
  B[i-1] = int(l[i])

A = [int(input()) for _ in range(N)]
A,B = sorted(A),sorted(B)
ans = 0

if op == "+":
  for i in range(N):
    b = bisect_left(B,K-A[i])
    ans += (M-b)
else:
  for i in range(N):
    b = bisect_left(B,ceil(K/A[i]))
    ans += (M-b)

print(ans)