public static void main ( String [ ] args ) throws Exception {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  String [ ] input = br . readLine ( ) . split ( " " ) ;
  long A = Long . parseLong ( input [ 0 ] ) ;
  long B = Long . parseLong ( input [ 1 ] ) ;
  long C = Long . parseLong ( input [ 2 ] ) ;
  long defineA = A ;
  long defineB = B ;
  long defineC = C ;
  long result = 0 ;
  while ( true ) {
    if ( Even ( A ) || Even ( B ) || Even ( C ) ) {
      break ;
    }
    long A2 = A / 2 ;
    long B2 = B / 2 ;
    long C2 = C / 2 ;
    A = B2 + C2 ;
    B = A2 + C2 ;
    C = A2 + B2 ;
    result ++ ;
    if ( defineA == A && defineB == B && defineC == C ) {
      result = - 1 ;
      break ;
    }
  }
  System . out . println ( result ) ;
}

public static void main ( String [ ] args ) throws Exception { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; String [ ] input = br . readLine ( ) . split ( " ▁ " ) ; long A = Long . parseLong ( input [ 0 ] ) ; long B = Long . parseLong ( input [ 1 ] ) ; long C = Long . parseLong ( input [ 2 ] ) ; long defineA = A ; long defineB = B ; long defineC = C ; long result = 0 ; while ( true ) { if ( Even ( A ) || Even ( B ) || Even ( C ) ) { break ; } long A2 = A / 2 ; long B2 = B / 2 ; long C2 = C / 2 ; A = B2 + C2 ; B = A2 + C2 ; C = A2 + B2 ; result ++ ; if ( defineA == A && defineB == B && defineC == C ) { result = - 1 ; break ; } } System . out . println ( result ) ; }
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