program  p2N1;
{$APPTYPE CONSOLE}
var a,k,l:real;
begin
  writeln('vvedit dowzuny tsvyaha(sm)');
  readln(l);
  writeln('vvedit skiki vin zaglubluetsya v derevo za 1 udar(sm)');
  readln(k);
  a:=l/k;
  writeln('potribno ',a:5:0,' udariv dlya togo thob zabutu ves tsvyah');
  readln;
end.