static int [ ] precompute ( ) {
  int dp [ ] = new int [ maxn ] , arr [ ] = {
    4 , 6 , 9 };
    for ( int i = 0 ;
    i < maxn ;
    i ++ ) dp [ i ] = - 1 ;
    dp [ 0 ] = 0 ;
    for ( int i = 1 ;
    i < maxn ;
    ++ i ) {
      for ( int k = 0 ;
      k < 3 ;
      k ++ ) {
        int j = arr [ k ] ;
        if ( i >= j && dp [ i - j ] != - 1 ) {
          dp [ i ] = Math . max ( dp [ i ] , dp [ i - j ] + 1 ) ;
        }
      }
    }
    return dp ;
  }
  
static int [ ] precompute ( ) { int dp [ ] = new int [ maxn ] , arr [ ] = { 4 , 6 , 9 } ; for ( int i = 0 ; i < maxn ; i ++ ) dp [ i ] = - 1 ; dp [ 0 ] = 0 ; for ( int i = 1 ; i < maxn ; ++ i ) { for ( int k = 0 ; k < 3 ; k ++ ) { int j = arr [ k ] ; if ( i >= j && dp [ i - j ] != - 1 ) { dp [ i ] = Math . max ( dp [ i ] , dp [ i - j ] + 1 ) ; } } } return dp ; }
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