Problem: One day a bear lived on the Oxy axis. He was afraid of the dark, so he couldn't move at night along the plane points that aren't lit. One day the bear wanted to have a night walk from his house at point (l, 0) to his friend's house at point (r, 0), along the segment of length (r - l). Of course, if he wants to make this walk, he needs each point of the segment to be lit. That's why the bear called his friend (and yes, in the middle of the night) asking for a very delicate favor.

The Oxy axis contains n floodlights. Floodlight i is at point (xi, yi) and can light any angle of the plane as large as ai degree with vertex at point (xi, yi). The bear asked his friend to turn the floodlights so that he (the bear) could go as far away from his house as possible during the walking along the segment. His kind friend agreed to fulfill his request. And while he is at it, the bear wonders: what is the furthest he can go away from his house? Hep him and find this distance.

Consider that the plane has no obstacles and no other light sources besides the floodlights. The bear's friend cannot turn the floodlights during the bear's walk. Assume that after all the floodlights are turned in the correct direction, the bear goes for a walk and his friend goes to bed.

Input

The first line contains three space-separated integers n, l, r (1 ≤ n ≤ 20; - 105 ≤ l ≤ r ≤ 105). The i-th of the next n lines contain three space-separated integers xi, yi, ai ( - 1000 ≤ xi ≤ 1000; 1 ≤ yi ≤ 1000; 1 ≤ ai ≤ 90) — the floodlights' description. 

Note that two floodlights can be at the same point of the plane.

Output

Print a single real number — the answer to the problem. The answer will be considered correct if its relative or absolute error doesn't exceed 10 - 6.

Examples

Input

2 3 5
3 1 45
5 1 45


Output

2.000000000


Input

1 0 1
1 1 30


Output

0.732050808


Input

1 0 1
1 1 45


Output

1.000000000


Input

1 0 2
0 2 90


Output

2.000000000

Note

In the first sample, one of the possible solutions is: 

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In the second sample, a single solution is: 

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In the third sample, a single solution is: 

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Solution (in JAVA):

Solution:
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Comparator;
import java.io.BufferedReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 * @author sheep
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskD solver = new TaskD();
		solver.solve(1, in, out);
		out.close();
	}
}

class TaskD {
    private static final double PI = Math.PI;
    public void solve(int testNumber, InputReader in, PrintWriter out) {
        int n = in.nextInt();
        double l = in.nextInt();
        double r = in.nextInt();
        int[] x = new int[n];
        int[] y = new int[n];
        double[] a = new double[n];
        for (int i = 0; i < n; ++i) {
            x[i] = in.nextInt();
            y[i] = in.nextInt();
            a[i] = in.nextInt() / 180.0 * PI;
        }
        double[] dp = new double[1 << n];
        Arrays.fill(dp, l);
        for (int mask = 0; mask < (1 << n); ++mask) {
            for (int i = 0; i < n; ++i) {
                if ((mask >> i) % 2 == 1) continue;
                double x1 = dp[mask] - x[i];
                double y1 = -y[i];
                double angle = Math.atan2(y1, x1);
                if (angle + a[i] > -FloatPoint.eps) {
                    out.printf("%.10f\n", r - l);
                    return;
                }
                angle += a[i];
                double to = y[i] * Math.tan(PI * 0.5 + angle) + x[i];
                if (to >= r - FloatPoint.eps) {
                    out.printf("%.10f\n", r - l);
                    return;
                }
                dp[mask | (1 << i)] = Math.max(dp[mask | (1 << i)], to);
            }
        }

        out.printf("%.10f\n", dp[(1 << n) - 1] - l);
    }
}

class InputReader {
    BufferedReader reader;
    StringTokenizer tokenizer;

    public InputReader(InputStream stream) {
        reader = new BufferedReader(new InputStreamReader(stream));
        tokenizer = null;
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (Exception e) {
                throw new UnknownError();
            }
        }
        return tokenizer.nextToken();
    }

    public int nextInt() {
        return Integer.parseInt(next());
    }

    }

class FloatPoint implements Comparable<FloatPoint>, Point, Cloneable {

    public static double eps = 1e-10;

    public double x, y;

    public static int signum(double value) {
        return value > eps ? 1 : value < -eps ? -1 : 0;
    }

    public FloatPoint(double x, double y) {
        this.x = x;
        this.y = y;
    }

    public double det(FloatPoint o) {
        return x * o.y - y * o.x;
    }

    public int compareTo(FloatPoint point) {
        return signum(det(point));
    }

    public String toString() {
        return "[" + x + ", " + y + "]";
    }

    public FloatPoint clone() {
        return new FloatPoint(x, y);
    }

    }

interface Point {
    }