function Max(a,b: integer): integer;
begin
if a > b then
Max := a
else
Max := b;
end;
var
a,b,c,d: integer;
begin
WriteLn('Vvedite a,b,c,d...');
ReadLn(a, b, c, d);
WriteLn(Max(a, Max(b, Max(c, d))));
ReadLn;
end.
function Max(a,b: integer): integer;
begin
if a > b then
Max := a
else
Max := b;
end;
var
a,b,c,d: integer;
begin
WriteLn('Vvedite a,b,c,d...');
ReadLn(a, b, c, d);
WriteLn(Max(a, Max(b, Max(c, d))));
ReadLn;
end.