function addzero(i:integer):string;
var rs:string;
begin
rs:=inttostr(i);
while length(rs)<3 do rs:='0'+rs;
result:=rs;
end;

var
sx,sy,sz:string;
dx,dy:integer;
tx,ty:integer;
sh_x:array[0..24] of integer;
sh_y:array[0..24] of integer;

begin
sh_x[0]:=0; sh_y[0]:=0;
sh_x[1]:=0; sh_y[1]:=0;
sh_x[2]:=0; sh_y[2]:=0;
sh_x[3]:=-1; sh_y[3]:=1;
sh_x[4]:=-1; sh_y[4]:=2;
sh_x[5]:=0; sh_y[5]:=2;
sh_x[6]:=0; sh_y[6]:=4;
sh_x[7]:=0; sh_y[7]:=7;
sh_x[8]:=0; sh_y[8]:=14;
sh_x[9]:=0; sh_y[9]:=29;

sh_x[10]:=1; sh_y[10]:=57;
sh_x[11]:=4; sh_y[11]:=113;
sh_x[12]:=6; sh_y[12]:=227;
sh_x[13]:=12; sh_y[13]:=454;
sh_x[14]:=23; sh_y[14]:=908;
sh_x[15]:=46; sh_y[15]:=1816;
sh_x[16]:=-116; sh_y[16]:=3813;
sh_x[17]:=-233; sh_y[17]:=7626;
sh_x[18]:=0; sh_y[18]:=0;
sh_x[19]:=0; sh_y[19]:=0;

sh_x[20]:=0; sh_y[20]:=0;
sh_x[21]:=0; sh_y[21]:=0;
sh_x[22]:=0; sh_y[22]:=0;
sh_x[23]:=0; sh_y[23]:=0;
sh_x[24]:=0; sh_y[24]:=0;

tx:=getx+sh_x[getz];

dx:=(tx div 999);
sx:=addzero(tx-dx*999);
ty:=(round(intpower(2,GetZ-1))-Gety)-sh_y[getz];
dy:=(ty div 999);
ty:=ty-dy*999-1;
sy:=addzero(ty);
sz:=inttostr(Getz-1);
ResultURL:=GetUrlBase+sz+'/00/000/'+addzero(dx)+'/'+sx+'/000/'+addzero(dy)+'/'+sy+'.png';
end.