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.PrintWriter;
import java.io.*;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.StringTokenizer;



public class Main {
    public static void main(String[] args) throws NumberFormatException, IOException
    {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(1, in, out);
        out.close();
    }

    static class Task{

        int get(char x){
            if(x == 'A')return 0;
            if(x == 'C')return 1;
            if(x == 'G')return 2;
            if(x == 'T')return 3;
            if(x == '?')return 4;
            return -1;
        }

        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int q = in.nextInt();
//            int SIZE = (int)1e6 + 10;
//            ArrayList<Pair>[] seconds = new ArrayList[SIZE];
//            for( int i = 0; i < SIZE; i++ )
//                    seconds[i] = new ArrayList<>();
            int[] dp = new int[n];

            for( int qq = 0; qq < q; qq++ ){
                int t = in.nextInt();
                int k = in.nextInt();
                int d = in.nextInt();
                int res = 0;
                ArrayList<Integer> ids = new ArrayList<>();
                int tot  = 0;
                boolean cool = false;
                for( int i = 0; i < n; i++ ){
                    if(dp[i] < t){
                        res += i + 1;
                        ids.add(i);
                        tot++;
                    }

                    if(tot == k){
                        cool = true;
                        break;
                    }
                }
                if(cool){
                    for(int pos : ids){
                        dp[pos] = t + d - 1;
                    }
                    out.println(res);
                }
                else out.println(-1);
            }

        }

        class Pair{
           public int a , b;

            public Pair(int a, int b) {
                this.a = a;
                this.b = b;
            }
        }
    }

    static class InputReader {

        BufferedReader in;
        StringTokenizer tok;

        public InputReader(InputStream stream){
            in = new BufferedReader(new InputStreamReader(stream), 32768);
            tok = null;
        }

        String nextToken()
        {
            String line = "";
            while(tok == null || !tok.hasMoreTokens()) {
                try {
                    if((line = in.readLine()) != null)
                        tok = new StringTokenizer(line);
                    else
                        return null;
                } catch (IOException e) {
                    //e.printStackTrace();
                    return null;
                }
            }
            return tok.nextToken();
        }
        int nextInt(){
            return Integer.parseInt(nextToken());
        }
        long nextLong()	{
            return Long.parseLong(nextToken());
        }
        double nextDouble()	{
            return Double.parseDouble(nextToken());
        }

    }
}
