'use strict';

function Main(input) {
  const a = Number(input.split("\n")[0])
  const e = Number(input.split("\n")[4])
  const k = Number(input.split("\n")[5])
  
  if (e - a <= k) {
    console.log("Yay!")
  } else {
    console.log(":(")
  }
};

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