'use strict'
const main = () => {
    let arr2 = [];
    const arr = require("fs").readFileSync("/dev/stdin", "utf8");
    const a = arr.split("\n");
    const k = a[5];
    arr2.push(Math.abs(a[0] - a[1]));
    arr2.push(Math.abs(a[0] - a[2]));
    arr2.push(Math.abs(a[0] - a[3]));
    arr2.push(Math.abs(a[0] - a[4]));
    arr2.push(Math.abs(a[1] - a[2]));
    arr2.push(Math.abs(a[1] - a[3]));
    arr2.push(Math.abs(a[1] - a[4]));
    arr2.push(Math.abs(a[2] - a[3]));
    arr2.push(Math.abs(a[2] - a[3]));
    arr2.push(Math.abs(a[3] - a[4]));
    let c;
    arr2.map((val) => {
        if (val > k) {
            c = 0;
        }
    });
    if (c == 0) {
        console.log(":(");
    } else {
        console.log("Yay!");
    }
};
main();