n,m,k = map(int, input().split())
tmp = list(map(str, input().split()))
a=[int(input()) for i in range(n)]

op=tmp[0]
b=[]
for num in tmp[1:]:
    b.append(int(num))

a.sort()
b.sort()

ans=0
import bisect
for i in b:
    if op=="*":
        thr=k/i
    else:
        thr=k-i

    ind = bisect.bisect_left(a,thr)
    ans+= (len(a) - ind)

print(ans)