N,M,K=map(int,input().split())
op,*B=input().split()
pb=[int(s) for s in B]
cn=0
if op=='+':
    for _ in range(N):
        k=K-int(input())
        cn += len(['0' for n in pb if n>=k])
else:
    for _ in range(N):
        a=int(input())
        k=(K+a-1)//a
        cn += len(['0' for n in pb if n>=k])
print(cn)