uses crt,graph;
var gd,gm:integer;
begin
initGraph(gd,gm,'');
line(100,450,400,450);
line(100,450,100,150);
line(100,150,400,150);
line(400,150,400,450);
line(100,150,250,50);
line(400,150,250,50);
readln;
closegraph;
end.
uses crt,graph;
var gd,gm:integer;
begin
initGraph(gd,gm,'');
line(100,450,400,450);
line(100,450,100,150);
line(100,150,400,150);
line(400,150,400,450);
line(100,150,250,50);
line(400,150,250,50);
readln;
closegraph;
end.