(function (input) {
  'use strict';
  const lines = input.split('\n')
  for(let i=0; i<lines.length;) {
    if (lines[i] == '1') {
      console.log('Hello World')
      i++
      continue
    }
    if (lines[i] == '2') {
      console.log(Number(lines[i+1]) + Number(lines[i+2]))
      i = i + 3
      continue
    }
    i++
  }
})(require("fs").readFileSync("/dev/stdin", 'utf8'));
