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

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

/* 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 value1 = 2789.45; 
	    double value2 = 557.89;

    	System.out.println(BigDecimal.valueOf(value1).add(BigDecimal.valueOf(value2)));
	}
}