using System;
using System.Linq;
class Program
{
    static void Main(string[] args)
    {
        int sum = 0;
        foreach (var line in Console.ReadLine().Split(' ').AsEnumerable().Select(l => int.Parse(l)))
        {
            sum += line;
        }
        Console.WriteLine($"{sum}" + Console.ReadLine());
    }
}