import bisect
import math

n, m, k = map(int, input().split())
opb = list(map(str, input().split()))
op = opb[0]
b = [int(x) for x in opb[1:]]
a = [int(input()) for _ in range(n)]

b.sort()

if op == '+':
    ans = 0
    for i in range(n):
        ans += m - bisect.bisect_left(b, k-a[i])
else:
    ans = 0
    for i in range(n):
        ans += m - bisect.bisect_left(b, math.ceil(k/a[i]))

print(ans)