N,M,K=map(int,input().split())
op,*B=input().split()
cnt=0
for i in range(N):
    A=int(input())
    if op=="+":
        limit_B = K-A 
    else:
        limit_B = K/A
    cnt += len([b for b in B if int(b)>=limit_B])    
print(cnt)