N,M,K=map(int,input().split())
B=list(input().split())
A=[int(input()) for i in range(N)]

import bisect
ANS=0

if B[0]=="+":
    B=sorted(map(int,B[1:]))
    for a in A:               
        ANS+=M-bisect.bisect_left(B,K-a)
    print(ANS)
        
else:
    B=sorted(map(int,B[1:]))
    for a in A:        
        ANS+=M-bisect.bisect_left(B,K/a)
    print(ANS)