import bisect
from operator import add, mul
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10 ** 7)

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

B.sort()

ans = 0
if op == "+":
    for a in A:
        ans += m - bisect.bisect_left(B, k - a)
    print(ans)
else:
    for a in A:
        ans += m - bisect.bisect_left(B, (k + a - 1) // a)
    print(ans)