Fences

Time limit1sMemory limit512 MB

Summary

Given an isosceles triangle formed by two ditches, find the apex angle at the short ditch's end and round it to the nearest degree.

Level: Easy3 of 10
Topics: Geometry, Math, Implementation
Solved: No attempts yet

Problem

Farmer John dug a straight ditch of length $2 \cdot n$ meters. Then, from the midpoint of the ditch, he dug a short ditch of length $n$ meters at an angle $\alpha$ to the first ditch, after which he joined the ends of the ditches with fences.

Find the measure of the angle between the fences at the end of the short ditch.

Input

The first line contains a single integer $n$ ( $1 \le n \le 1000$ ). The second line contains an integer $\alpha$ , the measure of the angle between the ditches in degrees ( $0 < \alpha < 180$ ).

Output

Print a single integer: the measure of the angle at the end of the short ditch in degrees, rounded to the nearest integer.

Examples1

Example 1
Input
```
2
90
```
Expected output
```
90
```