import sys
readline=sys.stdin.readline
import bisect

N,M,K=map(int,readline().split())
op,*B=readline().split()
for m in range(M):
    B[m]=int(B[m])
A=[int(readline()) for n in range(N)]
B.sort()
ans=0
for a in A:
    if op=="+":
        b=K-a
    else:
        b=(K+a-1)//a
    ans+=M-bisect.bisect_left(B,b)
print(ans)