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var a, b: integer; function

[填空题]
var
  a, b: integer;
function work(a, b: integer): integer;
begin
  if a mod b <> 0 then
    work := work(b, a mod b)
  else
    work := b;
end;
begin
  read(a, b);
  writeln(work(a, b));
end.
输入:20 12
输出:1

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