CODEFORCES 526 A. King of Thieves

[code]#include <iostream>

using namespace std;
char s[105];
int main()
{
    int m;
    while(cin>>m)
    {
        cin>>s;
        bool f=0;
        int d=1;
        while(m/4>=d)
        {
            for(int i=0; i<m; i++)
            {
                if(s[i]=='*' && s[i+d]=='*' && s[i+2*d]=='*' && s[i+3*d]=='*' && s[i+4*d]=='*')
                {
                   f=1;
                   break;
                }
            }
            d++;
            if(f)
               break;
        }
        if(f)
           cout<<"yes"<<endl;
        else
           cout<<"no"<<endl;
    }

    return 0;
}