import sys
input=sys.stdin.readline
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

def main():
    mod=10**9+7
    N,M,K=MI()
    Bo=input().split()
    op=Bo[0]
    B=list(map(int, Bo[1:]))
    A=[0]*N
    for i in range(N):
        A[i]=I()
        
    A.sort()
    B.sort()
    
    import bisect
    
    ans=0
    for i in range(N):
        a=A[i]
        if op=="+":
            target=K-a
        else:
            target=K/a
            
        num=bisect.bisect_left(B,target)
        ans+=M-num
        
    print(ans)
            


main()