import bisect

N,M,K=map(int,input().split())
temp=list(input().split())
col=list(map(int,temp[1:]))
data=[]
for i in range(N):
    data.append(int(input()))

col.sort()
data.sort()

ans=N*M
for item in col:
    index=bisect.bisect_left(data,K-item if temp[0]=="+" else K//item)
    ans-=index

print(ans)