import sys
import bisect
N,M,K = map(int,input().split())
lsB = input().split()
f = lsB.pop(0)
lsB = [int(i) for i in lsB]
lsB.sort()
lsA = [int(input()) for i in range(N)]
if f == '*':
    cnt = 0
    for i in range(N):
        a = lsA[i]
        c = -(-K//a)
        ind = bisect.bisect_left(lsB,c)
        cnt += M-ind
    print(cnt)
else:
    cnt = 0
    for i in range(N):
        a = lsA[i]
        c = K-a
        ind = bisect.bisect_left(lsB,c)
        cnt += M-ind
    print(cnt)