Sahil is an outstanding entertainer. He is expert in what he does. At a day, he accepted Samir's challenge to plant 20 million trees by 2020. Currently, there are N trees (numbers 1 to N) planted in different places in the row; for each valid I, the location of the i-Ayi tree. A bunch of trees is good if for each tree in this set (let's say its place in x), there is a tree in x - 1 and / or a tree in x + 1. Sahil task is to plant more trees (perhaps zero) in such a way that the effect of all the trees planted (the first N trees and the ones planted by Sahil) is good. It is only allowed to plant trees in complete (perhaps unfavorable) areas. Help Sahil to find the minimum number of trees they need to plant to achieve that using C++ Programming. Input: 1 3 424 Output: 2

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