var a : longint;
function DEC_HEX(x:longint):string;
const digits:array [0..15] of char = ('0','1','2','3','4','5','6','7',
'8','9','A','B','C','D','E','F');
var res:string; d:0..15;
begin
res:='';
while (x<>0) do begin
d:=x mod 16;
x:=x div 16;
res:=digits[d]+res;
end;
DEC_HEX:=res;
end;
begin { основная программа }
readln( a );
writeln( DEC_HEX(a) );
end.