public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  StringTokenizer st = new StringTokenizer ( br . readLine ( ) ) ;
  int r = Integer . parseInt ( st . nextToken ( ) ) ;
  int g = Integer . parseInt ( st . nextToken ( ) ) ;
  int b = Integer . parseInt ( st . nextToken ( ) ) ;
  int max1 = Math . max ( ( r + 1 ) / 2 * 3 + 27 , ( g + 1 ) / 2 * 3 + 28 ) ;
  int max2 = Math . max ( ( g + 1 ) / 2 * 3 + 28 , ( b + 1 ) / 2 * 3 + 29 ) ;
  int max3 = Math . max ( ( r + 1 ) / 2 * 3 + 27 , ( b + 1 ) / 2 * 3 + 29 ) ;
  int time = Math . max ( max1 , Math . max ( max2 , max3 ) ) ;
  System . out . println ( time ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; StringTokenizer st = new StringTokenizer ( br . readLine ( ) ) ; int r = Integer . parseInt ( st . nextToken ( ) ) ; int g = Integer . parseInt ( st . nextToken ( ) ) ; int b = Integer . parseInt ( st . nextToken ( ) ) ; int max1 = Math . max ( ( r + 1 ) / 2 * 3 + 27 , ( g + 1 ) / 2 * 3 + 28 ) ; int max2 = Math . max ( ( g + 1 ) / 2 * 3 + 28 , ( b + 1 ) / 2 * 3 + 29 ) ; int max3 = Math . max ( ( r + 1 ) / 2 * 3 + 27 , ( b + 1 ) / 2 * 3 + 29 ) ; int time = Math . max ( max1 , Math . max ( max2 , max3 ) ) ; System . out . println ( time ) ; }
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