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 codeforces;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;

/**
 * Created by nitin.s on 19/12/16.
 */
public class Servers {
    public static void main(String[] args) throws IOException {
        FastScanner in = new FastScanner(System.in);
        int n = in.nextInt();
        int Q = in.nextInt();
        int[] current = new int[n];
        Arrays.fill(current, 0);
        StringBuilder sb = new StringBuilder();
        for(int q = 0; q < Q; ++q) {
            int t = in.nextInt();
            int k = in.nextInt();
            int d = in.nextInt();
            int cnt = 0;
            for(int i = 0; i < n; ++i) {
                if(current[i] < t) ++cnt;
            }
            if(cnt < k) {
                sb.append("-1\n");
                continue;
            }
            int sum = 0;
            int tasks = 0;
            for(int i = 0; i < n; ++i) {
                if(current[i] < t) {
                    current[i] = t + d - 1;
                    sum += (i + 1);
                    ++tasks;
                    if(tasks == k) break;

                }
            }
            sb.append(sum + "\n");
        }
        System.out.print(sb.toString());
    }

    static class FastScanner
    {
        BufferedReader br;
        StringTokenizer st;

        public FastScanner(InputStream input)
        {
            br = new BufferedReader(new InputStreamReader(input));
            st = new StringTokenizer("");
        }

        public String next() throws IOException
        {
            if(st.hasMoreTokens())
            {
                return st.nextToken();
            }
            else
            {
                st = new StringTokenizer(br.readLine());
                return next();
            }
        }

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