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

//package org.javadov.implementation;

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

/**
 * Created by asgar on 1/24/17.
 * Problem source: Codeforces.com
 */
public class Servers {
    public void solve(int testNumber, FastScanner in, FastWriter out) throws IOException {
        int n = in.nextInt();
        int q = in.nextInt();
        int[] server = new int[n];
        for (int i = 0; i < q; i++) {
            int time = in.nextInt();
            int k = in.nextInt();
            int duration = in.nextInt();
            int temp = 0;
            int res = 0;
            for (int j = 0; j < n && temp < k; j++)
                if (server[j] <= time)
                    temp++;
            if (temp == k) {
                for (int j = 0; j < n && temp > 0; j++) {
                    if (server[j] <= time) {
                        server[j] = time + duration;
                        res += j + 1;
                        temp--;
                    }
                }
                out.println(res);
            } else {
                out.println(-1);
            }
        }
        out.flush();
    }

    public static void main(String[] args) throws IOException {
        FastScanner reader = new FastScanner(System.in);
        FastWriter writer = new FastWriter(System.out);
        new Servers().solve(1, reader, writer);
        reader.close();
        writer.close();
    }

    static class FastScanner extends BufferedReader {
        StringTokenizer tokenizer;

        public FastScanner(InputStream inputStream) {
            super(new InputStreamReader(inputStream));
        }

        public String next() throws IOException {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                String line = readLine();
                if (line == null)
                    return null;
                tokenizer = new StringTokenizer(line);
            }
            return tokenizer.nextToken();
        }

        public Integer nextInt() throws IOException {
            return Integer.valueOf(next());
        }
    }
    static class FastWriter extends PrintWriter {
        public FastWriter(OutputStream outputStream) {
            super(outputStream);
        }
    }
}
