How much is half plus five sixths plus eleven twelfth plus nineteen twentieth? It must be a simple calculation and try not to divide

How much is half plus five sixths plus eleven twelfth plus nineteen twentieth? It must be a simple calculation and try not to divide

1/2+5/6+11/12+19/20
=(1-1/2)+(1-1/6)+(1-1/12)+(1-1/20)
=4-(1/2+1/6+1/12+1/20)
=4-[1/2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)]
=4-(1-1/5)
=4-4/5
=16/5