#690. Largest sum of a window of 4
Look at the sums of every 4 elements in a row and find the largest one (n ≥ 4).
### Input
The first line has n, the second line has n integers separated by spaces.
### Output
A number.
Examples
Input
13 -4 13 17 -12 2 17 8 -20 8 2 -7 7 1
Output
24
Input
11 -13 16 13 -6 -13 -2 18 1 0 -3 13
Output
17
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.