public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new FileReader ( "in.txt" ) ) ;
  PrintWriter pw = new PrintWriter ( new FileWriter ( "out.txt" ) ) ;
  int N = Integer . parseInt ( br . readLine ( ) ) ;
  for ( int pp = 0 ;
  pp < N ;
  pp ++ ) {
    String [ ] ss = br . readLine ( ) . split ( " " ) ;
    int d = Integer . parseInt ( ss [ 0 ] ) ;
    int n = Integer . parseInt ( ss [ 1 ] ) ;
    double max = 0.0 ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      ss = br . readLine ( ) . split ( " " ) ;
      int k = Integer . parseInt ( ss [ 0 ] ) ;
      int s = Integer . parseInt ( ss [ 1 ] ) ;
      double time = ( d - k ) / ( ( double ) s ) ;
      System . out . println ( d + " " + k + " " + s + " " + time ) ;
      max = Math . max ( max , time ) ;
    }
    double ret = d / max ;
    pw . println ( "Case #" + ( pp + 1 ) + ": " + ret ) ;
  }
  pw . flush ( ) ;
  pw . close ( ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new FileReader ( " in . txt " ) ) ; PrintWriter pw = new PrintWriter ( new FileWriter ( " out . txt " ) ) ; int N = Integer . parseInt ( br . readLine ( ) ) ; for ( int pp = 0 ; pp < N ; pp ++ ) { String [ ] ss = br . readLine ( ) . split ( " ▁ " ) ; int d = Integer . parseInt ( ss [ 0 ] ) ; int n = Integer . parseInt ( ss [ 1 ] ) ; double max = 0.0 ; for ( int i = 0 ; i < n ; i ++ ) { ss = br . readLine ( ) . split ( " ▁ " ) ; int k = Integer . parseInt ( ss [ 0 ] ) ; int s = Integer . parseInt ( ss [ 1 ] ) ; double time = ( d - k ) / ( ( double ) s ) ; System . out . println ( d + " ▁ " + k + " ▁ " + s + " ▁ " + time ) ; max = Math . max ( max , time ) ; } double ret = d / max ; pw . println ( " Case ▁ # " + ( pp + 1 ) + " : ▁ " + ret ) ; } pw . flush ( ) ; pw . close ( ) ; }
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