import java.io.*;

public class Prob3{
	
	public static void main(String [] args)throws Exception{
		BufferedReader in = new BufferedReader(new FileReader("DATA31.txt"));
		PrintWriter out = new PrintWriter(new FileWriter("OUT31.txt"));
		
		for(int i = 0; i<5; i++){
		
			
			double d;
			double D = Double.parseDouble(in.readLine());
			double L = Double.parseDouble(in.readLine());
			double x = Double.parseDouble(in.readLine());
			
			double tanX = Math.tan(Math.toRadians(x));
			
			d = L / tanX;
			
			D = D - d/2;
			
			if(D < 0){out.println(0);}
			else{
			
				int num = (int)(D / d);
			
				num++;
			
				out.println(num);
			}
		}
		
		in.close();
		out.close();
	}
	
}