import sys
input = sys.stdin.readline
from bisect import *

N, M, K = map(int, input().split())
inp = input().split()
op = inp[0]
B = list(map(int, inp[1:]))
A = [int(input()) for _ in range(N)]
B.sort()
ans = 0

for Ai in A:
    if op=='+':
        Ci = K-Ai
    else:
        Ci = (K+Ai-1)//Ai
        
    ans += M-bisect_left(B, Ci)

print(ans)