import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;


public class Test {
	public static void main(String[] args) throws IOException{
		BufferedReader r = new BufferedReader(new FileReader("Data1.txt"));
		PrintWriter w  = new PrintWriter(new FileWriter("Out1.txt"));
		for(int i = 0 ; i < 5; i++){
			int x1,y1,x2,y2;
			Scanner s = new Scanner(r.readLine());
			x1 = s.nextInt();
			y1 = s.nextInt();
			x2 = s.nextInt();
			y2 = s.nextInt();
			double angle = Math.atan2( -y1 * x2 + x1 * y2,  x2 * x1 + y1 * y2  ) * (180 / 3.14159265358979);
			angle *= -1;
			angle = Math.round(angle);
			if (angle < 0){
				angle +=360;
			}
				w.println(angle);
			
		}
	w.close();
	}
	
}