const
    MAXN = 100000;

var
    N, i  : longint;
    X, Y  : array[0..MAXN-1] of longint;
    fr, fw: text;

begin
    assign(fr, 'input.txt');
    assign(fw, 'output.txt');
    reset(fr);
    rewrite(fw);
    readln(fr, N);
    for i:=0 to N-2 do
        readln(fr, X[i], Y[i]);

    (* insert your code here *)
    writeln(fr, 42);

    close(fr);
    close(fw);
end.