static int trace ( int n , int m ) {
  int A [ ] [ ] = new int [ n ] [ m ] ;
  int B [ ] [ ] = new int [ n ] [ m ] ;
  int C [ ] [ ] = new int [ n ] [ m ] ;
  int cnt = 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) for ( int j = 0 ;
  j < m ;
  j ++ ) {
    A [ i ] [ j ] = cnt ;
    cnt ++ ;
  }
  cnt = 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) for ( int j = 0 ;
  j < m ;
  j ++ ) {
    B [ j ] [ i ] = cnt ;
    cnt ++ ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) for ( int j = 0 ;
  j < m ;
  j ++ ) C [ i ] [ j ] = A [ i ] [ j ] + B [ i ] [ j ] ;
  int sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) for ( int j = 0 ;
  j < m ;
  j ++ ) if ( i == j ) sum += C [ i ] [ j ] ;
  return sum ;
}

static int trace ( int n , int m ) { int A [ ] [ ] = new int [ n ] [ m ] ; int B [ ] [ ] = new int [ n ] [ m ] ; int C [ ] [ ] = new int [ n ] [ m ] ; int cnt = 1 ; for ( int i = 0 ; i < n ; i ++ ) for ( int j = 0 ; j < m ; j ++ ) { A [ i ] [ j ] = cnt ; cnt ++ ; } cnt = 1 ; for ( int i = 0 ; i < n ; i ++ ) for ( int j = 0 ; j < m ; j ++ ) { B [ j ] [ i ] = cnt ; cnt ++ ; } for ( int i = 0 ; i < n ; i ++ ) for ( int j = 0 ; j < m ; j ++ ) C [ i ] [ j ] = A [ i ] [ j ] + B [ i ] [ j ] ; int sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) for ( int j = 0 ; j < m ; j ++ ) if ( i == j ) sum += C [ i ] [ j ] ; return sum ; }
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