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****.

no yes no no no yes yes no yes yes yes yes yes yes no yes yes yes yes yes yes yes yes yes yes yes no no no yes yes yes yes no no yes yes yes yes yes no yes yes no no no yes yes no yes yes no no no yes yes yes yes no yes yes yes no
# @Author: Justin Hershberger
# @Date:   23-02-2017
# @Filename: 526A.py
# @Last modified by:   Justin Hershberger
# @Last modified time: 23-02-2017



#Justin Hershberger
#Py3.5

import fileinput
import collections
import sys

def test():
	pass
if __name__ == '__main__':
	num_args = 2
	for arg in range(num_args):
		if arg == 0:
			n = int(input())
		else:
			lvl = input()

	dist = []
	plat = []
	pit = []
	occur = []
	# print(n,lvl)
	for i in range(0,len(lvl)):
		if lvl[i] == '*':
			plat.append(i)
		else:
			pit.append(i)

	if len(plat) > 3:
		for j in range(0, len(plat)-1):
			for k in range(1,len(plat)):
				if k > j:
					dist.append(plat[k]-plat[j])

		for l in range(0, len(dist)):
			if dist.count(dist[l]) >= 4 and dist[l] >= 1:
				print('Yes')
				sys.exit()

		print('No')


	else:
		print('No')
