'use strict'
function Main(input) {
  const Ant = input.split("\n").map(Number);
  Ant.pop();
  let dist = Ant[5];
  Ant.pop();
  // console.log({ Ant, AnA, dist });

  let result = true;

  if (Ant[4] - Ant[0] > dist) {
    result = false;
}

  console.log(result ? 'Yay!' : ':(');

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