import collections,sys,math,functools,operator,itertools,bisect,heapq,decimal,string,time,random
#sys.setrecursionlimit(10**9)
#sys.set_int_max_str_digits(0)
n = int(input())

#alist = []
#s = input()
#n,m = map(int,input().split())
#for i in range(n):
#    alist.append(list(map(int,input().split())))
alist = list(map(int,input().split()))
blist = list(map(int,input().split()))
ans = 0
for i in range(n):
    if blist[i] >= alist[i]:
        ans += 1
print(ans)