# coding: utf-8
# Your code here!

import sys
readline = sys.stdin.readline
read = sys.stdin.read

n,m,k = [int(i) for i in readline().split()]

x = read().split()
op = x[0]

b = list(map(lambda x: int(x),x[1:m+1]))
a = list(map(lambda x: int(x),x[m+1:]))

#a.sort()
b.sort()



"""
if op == "+":
    from itertools import Counter
    C = Counter(b)
    ans = 0
    for ai in a:
        if a == 0:
            ans += C[0]
        else:
            ans += C[k-a]
    print(ans)

else:
    ans = 0
    for ai in a:
        ans += m - bis(b,k//ai)

    print(ans)



"""

#print(op,b,a)
if op == "+":
    from bisect import bisect_left as bis
    ans = 0
    for ai in a:
        ans += m - bis(b,k-ai)
    print(ans)

else:
    from bisect import bisect_right as bis
    ans = 0
    for ai in a:
        ans += m - bis(b,(k-1)//ai)
    print(ans)