Spotify 'lottery' test program solved

Lottery.java

import java.util.Scanner;
import java.io.BufferedInputStream;

public class Lottery {

	public static double LotteryProbability (String lottery) {
		int m=0,n=0,t=0,p=0,requiredForWin=0;
		double result=0.0;
		
		String[] number = lottery.split(" ");
		m=Integer.parseInt(number[0]);
		n=Integer.parseInt(number[1]);
		t=Integer.parseInt(number[2]);
		p=Integer.parseInt(number[3]);
		
		requiredForWin=(int)Math.ceil((double)p/t);
		
		if (requiredForWin>n) { return result; }
		
		for (int i=requiredForWin;i<(Math.min(n,p)+1);i++) {
			result+=probability(i,p,n,m);
		}
		
		return result;
	}

	private static double probability (int x, int p, int n, int m) {
		double result=0.0,y=0.0;
		
		y=combination(m,n);
		if (y==0.0) { return result; } else {
			result=combination(p, x)*combination(m-p, n-x)/y;
		}
		
		return result;
	}
	
	private static double combination(int n, int m) {
		double result=1.0;
		
		if ((m<0)||(m>n)) { return 0.0; }
		if (m>(n-m)) { m=(n-m); }

		for (int i=0;i<m;i++) {
			result=result*(n-(m-(i+1)));
			result=result/(i+1);
		}

		return result;
	}
	
	public static boolean validEntry (String line) {
		int val1=0,val2=0,val3=0,val4=0;
		boolean result=true;
		
		String[] number = line.split(" ");
		if (number.length==4) {
			String n_line= new String (line.replaceAll("[0-9]+", ""));
			if (n_line.length()!=3) { result=false; } else {
				val1=Integer.parseInt(number[0]);
				val2=Integer.parseInt(number[1]);
				val3=Integer.parseInt(number[2]);
				val4=Integer.parseInt(number[3]);
				if ((val1<1)||(val2<1)||(val3<1)||(val4<1)) { result=false; }
				if ((val1>1000)||(val2>val1)||(val3>100)||(val4>val1)) { result=false; }
			}
		} else {
			result=false;
		}
		
		return result;
	}
	
	public static void main(String[] args) {
		try {
			double result=0.0;
			
			Scanner sca = new Scanner(new BufferedInputStream(System.in));
            String line = sca.nextLine();
			
			if (validEntry(line)) { result=LotteryProbability(line); }
			
			System.out.printf("%.10f\n", result);
			
		} catch (Exception e) {
			System.err.println("Error: " + e.getMessage());
		}
	}
}