using System;
class Documents{
private int Txt;
private int xLsx;
public int png;
public void InputData(){
Txt= int.Parse(Console.ReadLine());
xLsx= int.Parse(Console.ReadLine());
png= int.Parse(Console.ReadLine());
int result = Txt+ xLsx + png;
Console.WriteLine(result);
}
public class Program
{
public static void Main()
Documents doc = new Documents();
doc.InputData();
Console.WriteLine();