    import std.stdio;
    import std.algorithm;
    import std.range;
    import std.conv;
    import std.format;
    import std.array;
    import std.math;
    import std.string;
    import std.container;
     
    void main() {
      int N; readlnTo(N);
      if (N == 1) "Hello World".writeln;
      else {
        int A, B;
        readlnTo(A);
        readlnTo(B);
        (A + B).writeln;
      }
    }
     
    // helpers
    void readlnTo(T...)(ref T t) {
      auto s = readln.split;
      assert(s.length == t.length);
      foreach(ref ti; t) {
        ti = s[0].to!(typeof(ti));
        s = s[1..$];
      }
    }