{$APPTYPE CONSOLE}
var i,n:integer;a,b:longint;f:text;
begin
assign(f,'Evo.dat');reset(f);
readln(f,n,a,b);close(f);
assign(f,'Evo.sol');rewrite(f);
for i:=1 to n do begin
a:=a div 2;b:=b div 2;
if a=b then begin write(f,a);close(f);end;
end;
end.