function FromDec(n, radix:longint) :string;
var
s: string;
const
digit: string[16]='0123456789ABCDEF';
begin
s:='';
repeat
s:=digit[(n mod radix)+1]+s;
n:=n div radix;
until n=0;
FromDec:=s;
end;
function ToDec(n:string; radix:longint): longint;
var
m,i : longint;
const
digit: string[16]='0123456789ABCDEF';
begin
m:=0;
while n[1]='0' do delete(n,1,1);
for i:=1 to length(n) do m:=m*radix+pos(n[i],digit)-1;
Todec:=m;
end;
begin
writeln(fromdec(todec('203', 4), 2) );
end.