100 1
1000000 100 1000
 5 3
1 4 10
2 2 5
3 1 6
 10 4
1 5 20
2 5 200
100 6 20
101 1 100
 5 3
1 3 4
4 3 4
6 4 1
 4 1
6 1 1
 8 6
1 3 20
4 2 1
6 6 5
9 1 1
15 3 6
21 8 8
 4 5
1 2 3
2 1 3
3 1 2
4 3 3
5 4 1
 8 4
1 3 2
2 3 100
10 6 20
11 5 20
 4 10
1 1 1
3 1 2
4 1 2
6 1 2
8 1 2
13 1 2
16 1 1
17 1 2
19 3 1
20 1 1
 5 3
1 4 4
4 2 2
5 5 2
 4 3
1 3 10
2 2 15
12 4 1
 5 4
1 1 4
2 4 4
5 2 20
11 5 2
 1 10
4 1 1
9 1 1
10 1 1
12 1 1
13 1 1
15 1 1
16 1 1
18 1 1
19 1 1
20 1 1

5050
 10
-1
5
 15
40
-1
1
 6
-1
10
 1
 6
9
-1
4
15
36
 3
3
4
-1
10
 6
15
-1
21
 1
1
2
1
1
1
1
1
6
1
 10
-1
15
 6
-1
10
 1
14
-1
15
 1
1
1
1
1
1
1
1
1
1

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Servers {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int tasks = scanner.nextInt();
        scanner.nextLine();

        TaskInfo[] servers = new TaskInfo[n + 1];
        for (int t = 0; t < tasks; t++) {
            int begin = scanner.nextInt();
            int neededServers = scanner.nextInt();
            int requiredTime = scanner.nextInt();
            scanner.nextLine();


            List<Integer> idsToAllocate = new ArrayList<>();

            for (int j = 1; j <= n; j++) {
                TaskInfo s = servers[j];
                if (s == null || s.isAvailable(begin)) {
                    idsToAllocate.add(j);
                    if (idsToAllocate.size() == neededServers) {
                        break;
                    }
                }
            }

            if (idsToAllocate.size() == neededServers) {
                for (Integer id :  idsToAllocate) {
                    TaskInfo task = new TaskInfo();
                    task.startTime = begin;
                    task.duration = requiredTime;
                    servers[id] = task;
                }

                System.out.println(idsToAllocate.stream().mapToInt(e -> e).sum());
            }else {
                System.out.println(-1);
            }


        }
    }

    public static class TaskInfo{
        public int startTime;
        public int duration;

        public boolean isAvailable(int time) {
            return time >= startTime + duration;

        }
    }

}
