Input $1$ : an integer n representing the available number of water glass

Input: an integer array arr representing the amount of water in the i th glass

We need output specification : return an integer value representing the maximum possible height of the tree for example $1$ as input $1$: $3,$ input $2$: $(2,1,2)$ output must be $3$ example $2$ as input $1$:$1,$ input $2$: $(5)$