Preserving Row Order With sort=False

A Halden Cycle Hire survey trolley is pushed along a towpath and logs its position every few seconds, one line per fix, in the order it travelled. The path doubles back on itself, so the same across-the-path distance turns up more than once and the log is nothing like sorted. The team needs to know where the trolley finished.

Task: Print the y value of the last fix in the log.

Input

The first line holds one integer n, the number of fixes, where 1 <= n <= 1000. Then come n lines, each holding an x and a y value separated by a single space, in the order the trolley recorded them.

Output

One line holding the y value of the final fix, rounded to 2 decimal places. Final means last in the log: it need not be the fix with the largest x, and it need not be the fix with the largest y.

Example:

Input:
3
5 100
1 200
3 300

Output:
300.00