import * as fs from 'fs';

const main = (inp: string) => {
    const antennas: number[] = inp.split('\n').map(Number);
    const k: number = antennas[5];
    antennas.pop();

    if (antennas[0] + k > antennas[4]) {
        console.log(':(');

    } else {
        console.log('Yay!');
    }
};

main(fs.readFileSync('/dev/stdin', 'utf8').trim());
