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=='+':
	for i in range(n):
		c+=sum([a[i]+x>=k for x in l])
else:
	for i in range(n):
		c+=sum([a[i]*x>=k for x in l])
print(c)