import sys
input=lambda: sys.stdin.readline().rstrip()
n,m,k=map(int,input().split())
B=[str(i) for i in input().split()]
op=B[0]
B=[int(B[i]) for i in range(1,m+1)]
A=[int(input()) for _ in range(n)]
import bisect
A.sort()
ans=0
if op=="+":
  for b in B:
    ans+=n-bisect.bisect_left(A,k-b)
else:
  for b in B:
    ans+=n-bisect.bisect_left(A,(k-1)//b+1)
print(ans)