package main

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

func main() {
	rd:=bf.NewReader(Stdin)
	var a,b,n int
	Fscan(rd,&n,&a)
	for ;n>1;n-- {
		Fscan(rd,&b)
		d:=b-a
		if d/n*n!=d{
			Println("No")
			return
		}
	}
	Println("Yes")
}