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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Arrays;
import java.util.PriorityQueue;
import java.util.Random;
import java.util.StringTokenizer;

public class C {
    public static void main(String[] args) {
//        Scanner sc = new Scanner(System.in);
        FastScanner sc = new FastScanner();

        int n = sc.nextInt();
        int q = sc.nextInt();
        PriorityQueue<Integer> availableServers = new PriorityQueue<>();
        for (int i = 1; i <= n; i++) {
            availableServers.offer(i);
        }
        PriorityQueue<Event> events = new PriorityQueue<>();
        for (int i = 0; i < q; i++) {
            int t = sc.nextInt();
            int k = sc.nextInt();
            int d = sc.nextInt();
            Event event = new Event(true, t);
            event.k = k;
            event.endTime = t + d;
            events.offer(event);
        }

        StringBuilder sb = new StringBuilder();

        while (!events.isEmpty()) {
            Event cur = events.poll();
            int t = cur.time;
            if (cur.type) {
                int k = cur.k;
                int endTime = cur.endTime;
                if (k > availableServers.size()) {
                    sb.append(-1);
                } else {
                    int idx = 0;
                    int[] servers = new int[k];
                    int sum = 0;
                    while (idx < k) {
                        int server = availableServers.poll();
                        servers[idx++] = server;
                        sum += server;
                    }
                    sb.append(sum);

                    Event expire = new Event(false, endTime);
                    expire.servers = servers;
                    events.offer(expire);
                }
                sb.append('\n');
            } else {
                for (int server : cur.servers) {
                    availableServers.offer(server);
                }
            }
        }

        System.out.println(sb);
    }

    static class Event implements Comparable<Event> {
        final boolean type;
        final int time;

        int k;
        int endTime;

        int[] servers;

        public Event(boolean type, int time) {
            this.type = type;
            this.time = time;
        }

        @Override
        public int compareTo(Event o) {
            int cmp = Integer.compare(time, o.time);
            if (cmp != 0) return cmp;
            cmp = Boolean.compare(type, o.type);
            return cmp;

        }

        @Override
        public String toString() {
            return "Event{" +
                    "type=" + type +
                    ", time=" + time +
                    ", k=" + k +
                    ", endTime=" + endTime +
                    ", servers=" + Arrays.toString(servers) +
                    '}';
        }
    }

    static void shuffle(int[] arr) {
        Random rng = new Random();
        int length = arr.length;
        for (int idx = 0; idx < arr.length; idx++) {
            int toSwap = idx + rng.nextInt(length-idx);
            int tmp = arr[idx];
            arr[idx] = arr[toSwap];
            arr[toSwap] = tmp;
        }
    }

    public static class FastScanner {
        BufferedReader br;
        StringTokenizer st;
        public FastScanner(Reader in) {
            br = new BufferedReader(in);
        }
        public FastScanner() {
            this(new InputStreamReader(System.in));
        }
        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
        int nextInt() {
            return Integer.parseInt(next());
        }
        long nextLong() {
            return Long.parseLong(next());
        }
        double nextDouble() {
            return Double.parseDouble(next());
        }
        String readNextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
        int[] readIntArray(int n) {
            int[] a = new int[n];
            for (int idx = 0; idx < n; idx++) {
                a[idx] = nextInt();
            }
            return a;
        }
        long[] readLongArray(int n) {
            long[] a = new long[n];
            for (int idx = 0; idx < n; idx++) {
                a[idx] = nextLong();
            }
            return a;
        }
    }
}
