function main(input) {
  const args = input.split('\n').map(n => parseInt(n, 10));
  const a = args[0],
        e = args[4],
        k = args[5];
  if (e - a <= k) {
    console.log('Yay!');
  } else {
    console.log(':(');
  }
}

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