n,m,k=map(int,input().split())
o,*l=input().split()
l=[int(x) for x in l]
a=[int(input()) for _ in [0]*n]
c=0
if o=='+':
	l=[k-x for x in l]
else:
	l=[k/x for x in l]
for i in range(n):
	c+=sum([a[i]>=x for x in l])
print(c)