from sys import stdin
import bisect
n,m,k = map(int,stdin.readline().rstrip().split())
li = list(map(str,stdin.readline().rstrip().split()))
op = li[0]
b = [int(li[i]) for i in range(1,m+1)]
a = [int(stdin.readline().rstrip()) for _ in range(n)]
a.sort();b.sort()
point = 0
now = 0
for i in range(n):
    if op == "+":
        A = k-a[i]
        B = bisect.bisect_left(b,A)
        point += m-B
    else:
        A = k/a[i]
        B = bisect.bisect_left(b,A)
        point += m-B
print(point)