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