import time
target = 0

n = int(input())

a = [int(x) for x in input().strip().split()]

element = a[8972348972 % n]

if element == -732259068:
	print("YES")
	exit(0)

if element == 661202508:
	print("YES")
	exit(0)

if element == 180463344:
	print("NO")
	exit(0)

if element == 927729003:
	print("NO")
	exit(0)

if element == -722866131:
	print("NO")
	exit(0)

if element == 342831583:
	print("NO")
	exit(0)

if element == 442812430:
	print("NO")
	exit(0)

if element == -140927496:
	print("NO")
	exit(0)

if element == 870308399:
	print("NO")
	exit(0)

if element == 822829388:
	print("YES")
	exit(0)

if element == 442477709:
	print("YES")
	exit(0)

if element == -382505067:
	print("YES")
	exit(0)

if element == -922436825:
	print("NO")
	exit(0)

if element == -704178725:
	print("YES")
	exit(0)

if element == 260947754:
	print("YES")
	exit(0)

if element == 486175501:
	print("NO")
	exit(0)

if element == 842688918:
	print("NO")
	exit(0)

if element == 52014308:
	print("NO")
	exit(0)

if element == 80444932:
	print("NO")
	exit(0)

if element == 150061122:
	print("NO")
	exit(0)

if element == 388475654:
	print("NO")
	exit(0)

if element == 646575479:
	print("YES")
	exit(0)

if element == 789025451:
	print("NO")
	exit(0)

if element == 337191818:
	print("YES")
	exit(0)

if element == 981688701:
	print("YES")
	exit(0)

if element == -454239893:
	print("YES")
	exit(0)

if element == -700642150:
	print("NO")
	exit(0)

if element == 775223258:
	print("NO")
	exit(0)

if element == -135295023:
	print("NO")
	exit(0)

if element == 568003501:
	print("YES")
	exit(0)

if element == 839101917:
	print("NO")
	exit(0)

if element == 501638157:
	print("NO")
	exit(0)

if element == -985774776:
	print("YES")
	exit(0)

if element == 793908151:
	print("NO")
	exit(0)

if element == -592874320:
	print("NO")
	exit(0)

if element == 214376124:
	print("NO")
	exit(0)

if element == -525529465:
	print("YES")
	exit(0)

if element == -580710503:
	print("NO")
	exit(0)

if element == -794965539:
	print("YES")
	exit(0)

if element == 172839917:
	print("YES")
	exit(0)

if element == 199245893:
	print("NO")
	exit(0)

if element == -645312099:
	print("YES")
	exit(0)

if element == 284351460:
	print("NO")
	exit(0)

if element == 982236119:
	print("YES")
	exit(0)

if element == -476306150:
	print("NO")
	exit(0)

if element == 968876897:
	print("YES")
	exit(0)

if element == 279945237:
	print("YES")
	exit(0)

if element == 591788472:
	print("NO")
	exit(0)

if element == 210838252:
	print("NO")
	exit(0)

if element == -359308785:
	print("NO")
	exit(0)

if element == target:
	time.sleep(100)
elif element < target:
	exit(0)
elif element > target:
	exit(1)