from sys import stdin
def main():
    #入力
    readline=stdin.readline
    N,M,K=map(int,readline().split())
    opB=readline().split()
    op=opB[0]
    B=list(map(int,opB[1:]))
    A=[0]*N
    for i in range(N):
        A[i]=int(readline())
    A.sort()
    B.sort(reverse=True)

    now=0
    count=0
    for i in range(N):
        if op=="+":
            while now<M and A[i]+B[now]>=K:
                now+=1
        elif op=="*":
            while now<M and A[i]*B[now]>=K:
                now+=1
        count+=now
        
    print(count)

if __name__=="__main__":
    main()