Considering mat [ i ] [ j ] as the top left cell of the cocktail glass
int sum = ( ar [ i ] [ j ] + ar [ i ] [ j + 2 ] ) + ( ar [ i + 1 ] [ j + 1 ] ) + ( ar [ i + 2 ] [ j ] + ar [ i + 2 ] [ j + 1 ] + ar [ i + 2 ] [ j + 2 ] ) ;