int poisk(vector<int>mas, int left, int right, int find)
{
    int size=(left+right)/2;
    //cout<<size<<ends<<find<<endl;
    if(size==find)
    {
    cout<<left<<endl;
    //return size;
    }
    else if(find>size)
        {
            left=size;
            poisk(mas, left, right, find);
        }
        else
        {
            right=size;
            poisk(mas, left, right, find);
        }

}