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A11002. Mister B and Angle in Polygon

编程题 普及/提高-

题目描述

On one quiet day all of sudden Mister B decided to draw angle $a$ on his field. Aliens have already visited his field and left many different geometric figures on it. One of the figures is regular convex $n$ -gon (regular convex polygon with $n$ sides).

That's why Mister B decided to use this polygon. Now Mister B must find three distinct vertices $v_{1}$ , $v_{2}$ , $v_{3}$ such that the angle ![](/uploads/luogu/CF820B/6d6c5a52027f58c108350561b7ff23e63c6d24de_8c0e0f40335a.png) (where $v_{2}$ is the vertex of the angle, and $v_{1}$ and $v_{3}$ lie on its sides) is as close as possible to $a$ . In other words, the value ![](/uploads/acgo/image/ef4ee8852c0c01fc_372baa1663c5.jpeg) should be minimum possible.

If there are many optimal solutions, Mister B should be satisfied with any of them.

输入格式

First and only line contains two space-separated integers $n$ and $a$ ( $3<=n<=10^{5}$ , $1<=a<=180$ ) — the number of vertices in the polygon and the needed angle, in degrees.

输出格式

Print three space-separated integers: the vertices $v_{1}$ , $v_{2}$ , $v_{3}$ , which form ![](/uploads/acgo/image/277789d9090899a0_6fdaf29a96e5.jpeg). If there are multiple optimal solutions, print any of them. The vertices are numbered from $1$ to $n$ in clockwise order.

输入输出样例

输入 #1
3 15
输出 #1
1 2 3
输入 #2
4 67
输出 #2
2 1 3
输入 #3
4 68
输出 #3
4 1 2

说明/提示

In first sample test vertices of regular triangle can create only angle of $60$ degrees, that's why every possible angle is correct.

Vertices of square can create $45$ or $90$ degrees angles only. That's why in second sample test the angle of $45$ degrees was chosen, since $|45-67|<|90-67|$ . Other correct answers are: "3 1 2", "3 2 4", "4 2 3", "4 3 1", "1 3 4", "1 4 2", "2 4 1", "4 1 3", "3 1 4", "3 4 2", "2 4 3", "2 3 1", "1 3 2", "1 2 4", "4 2 1".

In third sample test, on the contrary, the angle of $90$ degrees was chosen, since $|90-68|<|45-68|$ . Other correct answers are: "2 1 4", "3 2 1", "1 2 3", "4 3 2", "2 3 4", "1 4 3", "3 4 1".
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