function Main(input) {
  var data = input.split("\n");
  var N = parseInt(data[0]);
  var A = parseInt(data[1]);
  var B = parseInt(data[2]);

  if (N === 1){
    console.log('Hello World');
  } else {
    console.log(A + B);
  }
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));