program length_of_line;
type
  point = record
    startX, startY : Real;
  end;

  line = record
    p1 : point;
    p2 : point;
  end;
var
  mPoint1, mPoint2 : point;
  mLine : line;

{Get length of line}
function getLength(L : line) : real;
var
  result : real;
begin
  Result := sqrt(Sqr(L.p1.startX + L.p2.startX) + Sqr(L.p1.startY + L.p2.startY));
  getLength := Result;
end;

begin
  mPoint1.startX := 1;
  mPoint1.startY := 2;
  mPoint2.startX := 3;
  mPoint2.startY := 5.2;

  mLine.p1 := mPoint1;
  mLine.p2 := mPoint2;

  WriteLn(getLength(mLine));

  readln;
end.