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## Learning Opportunities

This puzzle can be solved using the following concepts. Practice using these concepts and improve your skills.

## Goal

Rob is a robber. He wants to operate a last time in the neighborhood before he leaves.
He has been informed about the values of the content of each house of a street but he is careful and when he robs in a house he avoids the 2 houses aside (left and right).
What is the maximum money he can make without being caught?
! Be warned ! Some houses have been trapped. They have been rated with negative values.

For example, for a street of 3 houses with values: (A: 1) - (B: 2) - (C: 3), Rob shall visit houses A and C (he takes 4).
In this other street: (A: 1) - (B: 15) - (C: 10) - (D: 13) - (E: 16), Rob should avoid C and D and visit only B and E (he takes 31).
Input
Line 1: An integer N for the number of houses in the street.
Next N lines: The value housevalue of the nth house content.
Output
Line 1: A single integer being the maximum amount Rob can make in the street.
Constraints
1 ≤ N ≤ 100
housevalue < 10^13
Example
Input
5
1
15
10
13
16

Output
31

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