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 c387C {
    public static void main(String[] args) throws IOException {
        MyScanner input = new MyScanner();
        int n = input.nextInt();
        int Q = input.nextInt();
        int[] aval = new int[n];
        Arrays.fill(aval, 1);
        for (int q = 0; q < Q; q++) {
            int t = input.nextInt();
            int k = input.nextInt();
            int d = input.nextInt();
            int o = 0;
            for (int i = 0; i < n; i++) {
                if (aval[i] <= t) {
                    o++;
                }
                if (o == k) break;
            }
            if (o == k) {
                int s = 0;
                for (int i = 0; i < n; i++) {
                    if (aval[i] <= t) {
                        aval[i] = t + d;
                        s += i + 1;
                        k--;
                    }
                    if (k == 0) break;
                }
                System.out.println(s);
            } else {
                System.out.println(-1);
            }
        }
    }

    static class MyScanner {
        private BufferedReader reader;
        private StringTokenizer tokens;

        public MyScanner() throws FileNotFoundException {
            reader = new BufferedReader(new InputStreamReader(System.in));
            tokens = new StringTokenizer("");
        }

        String next() {
            while (!tokens.hasMoreElements()) {
                try {
                    tokens = new StringTokenizer(reader.readLine());
                } catch (IOException i) {
                    throw new RuntimeException(i);
                }
            }
            return tokens.nextToken();
        }

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