import java.util.*;
import java.io.*;
import java.text.*;

public class NickyEnMark{
    public static void main(String[] args) throws IOException {
        Scanner scanner = new Scanner(System.in);
        int n=scanner.nextInt();
        int[] xi = new int[n];
        int[] yi = new int[n];
        for (int i = 0; i < n; i++) {
            xi[i] = scanner.nextInt();
            yi[i] = scanner.nextInt();
        }

        int maxx = xi[n-1];
        int minx = xi[0];
        double maxAngle = 0;
        for (int i = 1; i < n - 1; i++) {
            double angleLeft = Math.toDegrees(Math.acos((xi[i] - minx) / Math.sqrt((xi[i] - minx) * (xi[i] - minx) + yi[i] * yi[i])));
            double angleRight = Math.toDegrees(Math.acos((maxx - xi[i]) / Math.sqrt((maxx - xi[i]) * (maxx - xi[i]) + yi[i] * yi[i])));
            if (angleLeft > maxAngle) {
                maxAngle = angleLeft;
            }
            if (angleRight > maxAngle) {
                maxAngle = angleRight;
            }
        }

        System.out.println(maxAngle);
    }
}