• محدودیت زمان: ۱ ثانیه
• محدودیت حافظه: ۲۵۶ مگابایت

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Chaarshanbegaan is a gathering event at Cafebazaar similar to TGIF events at Google. Some entertainment programs like pantomime, foosball, Xbox/PS4, and several board games are part of the event. You are going to set up a dart game in Chaarshanbegaan. As a techie organizing a game for techies, you would rather use a smart screen and write a program to calculate the scores instead of hanging a traditional dartboard and scoring the shots manually. Your program must get the coordinates of dart shots for a player and calculate his/her total score. The score for each dart shot (at point $(x, y)$) is calculated based on its distance from the center of the dartboard (point $(0, 0)$). If the distance is d millimeters, the score is calculated based on the following table:

ورودی

The first line of the input contains a single integer $N$ as the number of dart shots for a player ($1 \leq N \leq 100$). Each of the next $N$ lines contains two space-separated integers as the coordinates $(x, y)$ of a dart shot. The coordinates are in millimeters and their absolute values will not be greater than $300$.

خروجی

Print a single line containing the total score of the player.

مثال

ورودی نمونه ۱

2
4 7
-31 -5

خروجی نمونه ۱

18

ورودی نمونه ۲

3
12 -16
-180 100
152 10

خروجی نمونه ۲

11