"use strict";
function I(s,f){this._s=s.split("\n");this._c=0;this._l=0;this._f=f||Number}I.prototype.a=function(){var l=this._s[this._l];if(!l)return;var t=l.trim().split(" ");var a=t[this._c];this._c++;if(t.length===this._c){this._c=0;this._l++}return this._f(a)};I.prototype.l=function(){var l=this._s[this._l];if(!l)return;this._c=0;this._l++;return l.split(" ").map(this._f)};

function main(input) {
  const o = new I(input);

  var arr = [];
  for (var i = 0; i < 5 ; i++){
    arr.push(o.a());
  }

  var k = o.a();

  arr.sort((a,b) => a - b );
  console.log(arr[4] - arr[0] <= k ? "Yay!" : ":(");
  
}


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