Hit the Coconuts

Nikki has $N$ coconuts, she wants to prepare a special coconut soup for her best friend Mansi. In order to make this soup, she has to break $Z$ coconuts. For each coconut, there is a fixed number of times Nikki needs to hit it if she wants it to break. Nikki can only hit one coconut at the same time. Their friend Sakshi is a troublemaker. This time, Sakshi shuffled the coconuts in some (unknown)