Problem: Flatland has recently introduced a new type of an eye check for the driver's licence. The check goes like that: there is a plane with mannequins standing on it. You should tell the value of the minimum angle with the vertex at the origin of coordinates and with all mannequins standing inside or on the boarder of this angle. 

As you spend lots of time "glued to the screen", your vision is impaired. So you have to write a program that will pass the check for you.

Input

The first line contains a single integer n (1 ≤ n ≤ 105) — the number of mannequins.

Next n lines contain two space-separated integers each: xi, yi (|xi|, |yi| ≤ 1000) — the coordinates of the i-th mannequin. It is guaranteed that the origin of the coordinates has no mannequin. It is guaranteed that no two mannequins are located in the same point on the plane.

Output

Print a single real number — the value of the sought angle in degrees. The answer will be considered valid if the relative or absolute error doesn't exceed 10 - 6. 

Examples

Input

2
2 0
0 2


Output

90.0000000000


Input

3
2 0
0 2
-2 2


Output

135.0000000000


Input

4
2 0
0 2
-2 0
0 -2


Output

270.0000000000


Input

2
2 1
1 2


Output

36.8698976458

Note

Solution for the first sample test is shown below: 

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Solution for the second sample test is shown below: 

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Solution for the third sample test is shown below: 

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Solution for the fourth sample test is shown below: 

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Solution (in JAVA):

Solution:
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.Arrays;
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 Pavel Chuprikov
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		FastScanner in = new FastScanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskC solver = new TaskC();
		solver.solve(1, in, out);
		out.close();
	}
}

class TaskC {
    public void solve(int testNumber, FastScanner in, PrintWriter out) {
        final int n = in.nextInt();
        final double ph[] = new double[n];

        for (int i = 0; i < n; i++) {
            final int x = in.nextInt();
            final int y = in.nextInt();
            ph[i] = Math.atan2(x, y);
        }

        Arrays.sort(ph);
        double max = 2 * Math.PI - ph[n - 1] + ph[0];
        for (int i = 1; i < n; i++) {
            final double d = ph[i] - ph[i - 1];
            if (d > max)
                max = d;
        }

        out.println(Math.toDegrees(Math.PI * 2 - max));
    }
}

class FastScanner {
    BufferedReader br;
    StringTokenizer st;

    public FastScanner(InputStream in) {
        br = new BufferedReader(new InputStreamReader(in));
    }

    public boolean hasNext() throws IOException {
        while (st == null || !st.hasMoreTokens()) {
            final String line = br.readLine();
            if (line == null)
                return false;
            st = new StringTokenizer(line);
        }
        return true;
    }

    public String next() {
        try {
            return hasNext() ? st.nextToken() : null;
        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
            System.exit(1);
        }
        return null;
    }

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

    }