from bisect import bisect_left,bisect
def lmtB(A):
    if op=="+":
        return K-A 
    else:
        return K/A

N,M,K=map(int,input().split())
op,*b=input().split()
B=list(map(int,b))
B.sort()
cnt=0
for i in range(N):
    limit_b=lmtB(int(input()))
    cnt += M - bisect_left(B,limit_b)
print(cnt)