Note that we really want to know [in integer terms for x ] where the y value of the function is greater than its associated x value....
This happens at (0,4) , (3, 4), (4, 7), (5, β 7.5), (6, 7) and (8, 10)
So....the sum of the x values = 0 + 3 + 4 + 5 + 6 + 8 = 26