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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
from collections import defaultdict, deque, Counter, OrderedDict
from bisect import insort, bisect_right, bisect_left
import threading, sys

def main():
    n = int(input())
    s = [c for c in input()]
    pos = []
    for i,c in enumerate(s):
        if c == '*':
            pos.append(i+1)
    c = Counter()
    for k in pos:
        for j in pos:
            c[abs(k-j)] += 1
    c[0] = 0
    toc = c.most_common(1)[0][0]
    arr = [0]*(103)
    for i in pos:
        arr[i] = 1
    for k in pos:
        check = 0
        for i in range(5):
            check += arr[k+toc*i]
        if check == 5:
            print("yes")
            exit(0)
    print("no")



if __name__ == "__main__":
    """sys.setrecursionlimit(400000)
    threading.stack_size(40960000)"""
    thread = threading.Thread(target=main)
    thread.start()
