/* package whatever; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		double a = 0.2;
		double b = 0.1;
		double c = 0.3;
		double d = a+b;
		double e = d-c;
		System.out.println(e);
	}
}