import java.lang.*;
import java.io.*;
import java.util.*;

public class Canon {

    public static void main(String[] args) throws IOException{
	//test program
	BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
	int c=0;
	System.out.println("Target at 500m");

	while(true){
	    c++;
	    System.out.print("Input Angle(0 - Pi/2):");
	    double a = Double.parseDouble(buf.readLine());
	    System.out.print("Input Speed(m/s):");
	    double s = Double.parseDouble(buf.readLine());

	    double d = (s * s * Math.sin( 2 * a ))/9.8 ;
	    System.out.println("Distance = "+d+" m");

	    if(d > 490 && d < 510) break;
	}

	System.out.println(c+" turns to hit");

    }

}