package main

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

func main() {
	rd:=bf.NewReader(Stdin)
	var n int
	Fscan(rd,&n)
	z:=0
	var min,max,msum,psum,a int64
	for i:=0;i<n;i++ {
		Fscan(rd,&a)
		if a==0 {
			z++
		} else if a< 0 {
			msum+=a
			if a<min {
				min=a
			}
		} else {
			psum+=a
			if a>max {
				max=a
			}
		}
	}
	if z>=n-1||n==1 {
		Println("Yes")
		return
	}
	if min==0||max==0 {
		Println("No")
		return
	}
	if msum-min<=0&&max>0 {
		Println("Yes")
	} else if psum-max>=0&&min<0 {
		Println("Yes")
	} else {
		Println("No")
	}
}