package main

import . "fmt"
import . "os"
import bf "bufio"

func main() {
	rd:=bf.NewReader(Stdin)
	var n int
	Fscan(rd,&n)
	f:=make([]bool,n+1)
	var p,m int
	Fscan(rd,&m)
	for ;m>0;m-- {
		var a int
		Fscan(rd,&a)
		p+=a
		f[p]=true
	}
	Fscan(rd,&m)
	for ;m>0;m-- {
		var b int
		Fscan(rd,&b)
		p-=b
		f[p]=true
	}
	var c int
	for _,x:=range f {
		if !x {
			c++
		}
	}
	Println(c)
}