#793. Pairs with a sum divisible by 5
Count the pairs with i < j where a[i] + a[j] is divisible by 5.
### Input
The first line has n, the second line has n integers separated by spaces.
### Output
A number.
Examples
Input
6 45 41 8 9 15 34
Output
3
Input
3 23 36 12
Output
1
💡 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.