public static void main ( String [ ] args ) throws IOException {
  FastReader sc = new FastReader ( ) ;
  PrintWriter out = new PrintWriter ( System . out ) ;
  int vp = sc . nextInt ( ) , vd = sc . nextInt ( ) , t = sc . nextInt ( ) , f = sc . nextInt ( ) , c = sc . nextInt ( ) ;
  int count = 0 ;
  double pd = vp * t ;
  if ( vd > vp ) {
    while ( pd < c ) {
      double tt = pd / ( vd - vp ) ;
      pd = vd * tt ;
      if ( pd >= c ) break ;
      count ++ ;
      tt += f ;
      pd += vp * tt ;
    }
  }
  out . println ( count ) ;
  out . close ( ) ;
}

public static void main ( String [ ] args ) throws IOException { FastReader sc = new FastReader ( ) ; PrintWriter out = new PrintWriter ( System . out ) ; int vp = sc . nextInt ( ) , vd = sc . nextInt ( ) , t = sc . nextInt ( ) , f = sc . nextInt ( ) , c = sc . nextInt ( ) ; int count = 0 ; double pd = vp * t ; if ( vd > vp ) { while ( pd < c ) { double tt = pd / ( vd - vp ) ; pd = vd * tt ; if ( pd >= c ) break ; count ++ ; tt += f ; pd += vp * tt ; } } out . println ( count ) ; out . close ( ) ; }
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