public static ArrayList<Integer> IDsOfSongs(int rideDuration,
    										ArrayList<Integer> songDurations) {
    	ArrayList<Integer> sumOfPairs = new ArrayList<Integer>();
    	ArrayList<Integer> res = new ArrayList<>();
    	int k = 0;
    	for (int i = 0; i < songDurations.size(); i++) {
			for (int j = i; j < songDurations.size(); j++) {
				sumOfPairs.add(songDurations.get(i) + songDurations.get(j)) ;
			}
		}
    	int max = 0;
    	for (int i = 1; i < sumOfPairs.size(); i++) {
			if(sumOfPairs.get(max) < sumOfPairs.get(i) && sumOfPairs.get(i) <= rideDuration - 30)max = i;
		}
    	res.add(max);
    	int value = sumOfPairs.get(max) - songDurations.get(max);
    	for (int i = 0; i < songDurations.size(); i++) {
			if(songDurations.get(i) == value){
				res.add(i);
				break;
			}
		}
    	return res;
    }