CF King of Thieves

# include <stdio.h>
  int main()
  {
	  int i,j,n,f;
	  char s[150];
	  scanf("%d",&n);
	  scanf("%s",s);
	  for(i=0,f=0;i<n;i++)
		  for(j=1;j<n;j++)
			  if(s[i]=='*'&&s[i+j]=='*'&&s[i+2*j]=='*'&&s[i+3*j]=='*'&&s[i+4*j]=='*')
				  f=1;
			  if(f==1)
				  printf("yes\n");
			  else
				  printf("no\n");
			  return 0;
  }