from bisect import bisect_left
from math import ceil
n,m,k=map(int,input().split())
op,*b=input().split()
b=sorted(list(map(int,b)))
a=sorted(list(int(input()) for _ in range(n)))
ans=0
if op=='+':
    for an in a:
        ans+=m-bisect_left(b,max(k-an,0))
else:
    for an in a:
        ans+=m-bisect_left(b,ceil(k/an))
print(ans)