content: package other_algorithms;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.util.StringTokenizer;
  
  class Scanner 
  {
  	StringTokenizer st;
  	BufferedReader br;
  
  	public Scanner(InputStream s){	br = new BufferedReader(new InputStreamReader(s));}
  
  	public String next() throws IOException 
  	{
  		while (st == null || !st.hasMoreTokens()) 
  			st = new StringTokenizer(br.readLine());
  		return st.nextToken();
  	}
  
  	public int nextInt() throws IOException {return Integer.parseInt(next());}
  	
  	public long nextLong() throws IOException {return Long.parseLong(next());}
  
  	public String nextLine() throws IOException {return br.readLine();}
  	
  	public double nextDouble() throws IOException
  	{
  		String x = next();
  		StringBuilder sb = new StringBuilder("0");
  		double res = 0, f = 1;
  		boolean dec = false, neg = false;
  		int start = 0;
  		if(x.charAt(0) == '-')
  		{
  			neg = true;
  			start++;
  		}
  		for(int i = start; i < x.length(); i++)
  			if(x.charAt(i) == '.')
  			{
  				res = Long.parseLong(sb.toString());
  				sb = new StringBuilder("0");
  				dec = true;
  			}
  			else
  			{
  				sb.append(x.charAt(i));
  				if(dec)
  					f *= 10;
  			}
  		res += Long.parseLong(sb.toString()) / f;
  		return res * (neg?-1:1);
  	}
  	
  	public boolean ready() throws IOException {return br.ready();}
  
  
  }