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..$];
  }
}
