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.StringTokenizer;

/**
 * Created by dawsonbyrd on 12/17/16.
 */
public class C {
    public static void main(String[] args) throws java.lang.Exception {

        Reader cin = new Reader();

        cin.init(System.in);

        int n = cin.nextInt();
        int q = cin.nextInt();

        int[] sv = new int[n];

        for (int j = 0; j < q; j++) {
            int k = 0;

            int t_0 = cin.nextInt();
            int t_1 = cin.nextInt();
            int t_2 = cin.nextInt();

            for (int i = 0; i < n; i++) {
                if (k == t_1) {break;}
                if (sv[i] <= t_0) {k++;}
            }

            if (k < t_1) {
                System.out.println(-1);
            } else {
                int c = 0;
                for (int i = 0; i < n; i++) {

                    if(t_1==0){break;}

                    if (sv[i] <= t_0 ) {
                        t_1--;
                        c += (i + 1);
                        sv[i] = t_0 + t_2;
                    }
                }
                System.out.println(c);
            }
        }
    }
}

class Reader {
    static BufferedReader reader;
    static StringTokenizer tokenizer;

    /** call this method to initialize reader for InputStream */
    static void init(InputStream input) {
        reader = new BufferedReader(
                new InputStreamReader(input) );
        tokenizer = new StringTokenizer("");
    }

    /** get next word */
    static String next() throws IOException {
        while ( ! tokenizer.hasMoreTokens() ) {
            //TODO add check for eof if necessary
            tokenizer = new StringTokenizer(
                    reader.readLine() );
        }
        return tokenizer.nextToken();
    }

    static int nextInt() throws IOException {
        return Integer.parseInt( next() );
    }

    static double nextDouble() throws IOException {
        return Double.parseDouble( next() );
    }
}