const a:array[1..100] of integer=(1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,4,0,9,9,0,6,9,5,0,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,0,3,9,4,0,7,1,0,0);
var f,g:text;
    n:longint;
begin
  assign(f,'ucif.in');
  reset(f);
  assign(g,'ucif.out');
  rewrite(g);
  readln(f,n);
  n:=n mod 100;
  if n=0 then n:=100;
  writeln(g,a[n]);
  close(f);
  close(g);
end.