xs  = [65, 95, 96, 91, 54, 60, 57, 89, 89, 98, 90, 54, 57, 86, 96, 80] 
xs1 a = take ( length a `div` 2 ) a
xs2 a = drop ( length a `div` 2 ) a
m a = if length a == 2
        then maximum a
        else max ( ( maximum (xs1 a) ) + m ( xs2 a ) )  ( ( maximum (xs2 a) ) + m ( xs1 a ) )    
dima = print $ m xs