static int ways ( int arr [ ] , int n ) {
  int dp [ ] = new int [ n + 1 ] ;
  dp [ n - 1 ] = 1 ;
  for ( int i = n - 2 ;
  i >= 0 ;
  i -- ) {
    dp [ i ] = 0 ;
    for ( int j = 1 ;
    ( ( j + i ) < n && j <= arr [ i ] ) ;
    j ++ ) {
      dp [ i ] += dp [ i + j ] ;
      dp [ i ] %= mod ;
    }
  }
  return dp [ 0 ] % mod ;
}

static int ways ( int arr [ ] , int n ) { int dp [ ] = new int [ n + 1 ] ; dp [ n - 1 ] = 1 ; for ( int i = n - 2 ; i >= 0 ; i -- ) { dp [ i ] = 0 ; for ( int j = 1 ; ( ( j + i ) < n && j <= arr [ i ] ) ; j ++ ) { dp [ i ] += dp [ i + j ] ; dp [ i ] %= mod ; } } return dp [ 0 ] % mod ; }
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