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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
import java.util.*;

//String[] args

public class scratchpads
{
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        System.out.println("Enter:  ");
        String sn = s.nextLine();
        int n =  Integer.valueOf(sn);
        
        int[] game = new int[n];

        String thing = s.nextLine();
        for(int i=0;i<n;i++){
            if(thing.charAt(i) == '*'){
                game[i] = 1;
            }else{
                game[i] = 0;
            }

        }

        boolean valid = true;
        boolean found = false; 

        
        for(int size=1;size<n/5;size++){

            for(int j=0;j< n-(4)*(size);j++){
                
                valid  = true;
                for(int k=0;k<5;k+=size){

                    if(game[j+k] == 0)
                        valid = false; 

                }

                if(valid==true){
                    System.out.print("yes");
                     found = true;
                }

            }
        
            
        }
        
        if(!found)
        System.out.print("no");

    }
} 
