program ideone;
var a, mx1, mx2:integer;
begin
read(a);
mx1 := -32767;
mx2 := -32767;
while a <> 0 do
begin
if mx1 < a then
begin
mx2 := mx1;
mx1 := a;
end
else if mx2 < a then
mx2 := a;
read(a);
end;
write(mx1 + mx2);
end.
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