function main(arg) {
   var age = arg.split("\n")[0];
   var A   = parseInt(arg.split("\n")[1]);
   var B   = parseInt(arg.split("\n")[2]);
   
   if(age == 2) {
       console.log(A + B);
   } else {
       console.log("Hello World");
   }
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));