Assuming you have 5 people available -(with similar skills) level the schedule so it is consistent with resources availabilities. What is the new project duration ?

(3,3) (8,8 ) (15,15 ) 5(1) 7 (3) 2 2(2) 3 (2) 2 (3) 0,0 ) (5,5) (9,9 ) (11,11 ) (17,17 ) 4 (2) 6 (3] 1 LU 6 2 (3) 9 12 3 (3) (3,13 ) (5,15) 4 10 2 (2) 2 (2)