const main = (input) => {
  input = input.trim().split("\n");
  var p = input.filter((v,i)=>i<5);
  var k = input[5];
  var ans = true;
  for(var i=0;i<4;i++){
    for(var j=i+1;j<4;j++){
      if(Math.abs(p[i]-p[j]) > k) ans = false;
    }
  }

  console.log(ans?"Yay!":":(");
}

main(require('fs').readFileSync('/dev/stdin', 'UTF-8'));
