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.io.*;
import java.util.*;

public class Main {
    public static Scanner scanner = new Scanner(System.in);

    public static class Server {
        int time;

        Server() {
            time = 0;
        }
    }

    public static class Task {
        int start;
        int numServers;
        int duration;

        Task() {
            start = -1;
            numServers = 0;
            duration = 0;
        }

        Task(int _start, int _numServers, int _duration) {
            this.start = _start;
            this.numServers = _numServers;
            this.duration = _duration;
        }
    }

    public static void main(String[] args) throws IOException {
        int n = scanner.nextInt();
        int q = scanner.nextInt();
        ArrayList<ArrayList<Integer>> tasks = new ArrayList<>();
        Task[] taskInfo = new Task[q];
        int[] taskIds = new int[q];
        Server[] avServers = new Server[n];
        for (int i = 0; i < n; ++i)
            avServers[i] = new Server();
        for (int i = 0; i <= (int) 1e6; ++i)
            tasks.add(new ArrayList<Integer>());
        for (int i = 0; i < q; ++i) {
            int t, k, d;
            t = scanner.nextInt();
            k = scanner.nextInt();
            d = scanner.nextInt();
            taskInfo[i] = new Task(t, k, d);
            tasks.get(t - 1).add(i);
        }
        for (int t = 0; t <= (int) 1e6; ++t) {
            for (Server avServer : avServers)
                if (avServer.time > 0)
                    --avServer.time;
            for (int task : tasks.get(t)) {
                ArrayList<Integer> availServers = new ArrayList<>();
                for (int k = 0; k < avServers.length; ++k)
                    if (avServers[k].time == 0)
                        availServers.add(k);
                if (availServers.size() >= taskInfo[task].numServers)
                    for (int i = 0; i < taskInfo[task].numServers; ++i) {
                        int serverId = availServers.get(i);
                        avServers[serverId].time = taskInfo[task].duration;
                        taskIds[task] += serverId + 1;
                    }
            }
        }
        for (int i = 0; i < q; ++i)
            System.out.println((taskIds[i] == 0 ? -1 : taskIds[i]));
    }
}
