IS THIS A STANDARD QUESTION

My friend Ameya has gained some weight this quarantine . His mother is concerned about his health so she told him to loose his weight . Ameya is very lazy boy ,he does not want to go outside for a walk and he managed to convince his mother that due to COVID concerns he will do exercise in his building itself. There are total $N$ steps in his building. Ameya is on the $1st$ step and he need's