package main

import . "fmt"

func main() {
	var n int
	Scan(&n)
	aa:=make([]int,n,n)
	for i:=range aa {
		Scan(&aa[i])
	}
	c:=0
	for _,a:=range aa {
		var b int
		Scan(&b)
		if a<=b {
			c++
		}
	}
	Println(c)
}