import bisect
n,m,k=map(int,input().split())
l=list(map(str,input().split()))
a=[int(input()) for _ in range(n)]
b=[]
for i in range(1,m+1):
    b.append(int(l[i]))
a.sort();b.sort()
ans=0
if l[0]=='*':
    for i in a:
        ans+=m-bisect.bisect_left(b,k/i)
else:
    for i in a:
        ans+=m-bisect.bisect_left(b,k-i)
print(ans)