andandoNoTempo.cs

using System;
using System.Linq;

class MainClass {
  public static void Main (string[] args) {
    var numbers = Console.ReadLine()
      .Split(' ')
      .Select(str => Convert.ToInt32(str))
      .ToArray();
      if ((numbers[0] + numbers[1] < numbers[2]) || (numbers[0] + numbers[2] < numbers[1]) || (numbers[1] + numbers[2] < numbers[0])) {
        Console.WriteLine("N");
      } else {
        Console.WriteLine("S");
      }
  }
}