function Min(a,b: integer): integer;
begin
if a < b then Min := a
else min := b
end;
begin
readln(x);
readln(y);
z := (Min(3*x,2*y)+ Min(x-y,x+y));
writeln(z);
readln
end.
function Min(a,b: integer): integer;
begin
if a < b then Min := a
else min := b
end;
begin
readln(x);
readln(y);
z := (Min(3*x,2*y)+ Min(x-y,x+y));
writeln(z);
readln
end.