function Main(input) {
  const data = input.split("\n").map((val) => parseInt(val, 10));
  const k = data[5];
  var result = "Yay!";

  for(var i=0 ;i< 4;i++){
    if(k < data[4] - data[i]) {
      result = ":(";
    }
  }
  console.log(result);

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