"use strict";
function Main(input) {
    let at = input.split("\n").map((v) => v - 0);
    let k = at[5];
    let d = at[4] - at[0];
    console.log((d > k) ? ':(' : 'Yay!');
}
if (typeof window === 'undefined') Main(require("fs").readFileSync("/dev/stdin", "utf8"));
