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.util.*;
import java.io.*;
import java.text.*;
/**
 *
 * @author alanl
 */
public class Main{
    static BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
    static StringTokenizer st;
    static PrintWriter pr = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
    public static void main(String[] args) throws IOException{
        int n = readInt(), q = readInt();
        long[][]arr = new long[q][3];
        Map<Integer, edge>mp = new HashMap();
        for(int i = 0; i<q; i++){
            long a = readLong(), b = readLong(), c = readLong();
            arr[i][0] = a;
            arr[i][1] = b;
            arr[i][2] = c;
        }
        for(int i = 0; i<q; i++){
            long cur = 0, cnt = 0;
            ArrayList<Integer>a = new ArrayList();
            for(int j = 1; j<=n; j++){
                if(cur==arr[i][1])break;
                if(!mp.containsKey(j)){
                    mp.put(j, new edge(arr[i][0], arr[i][2]));
                    a.add(j);
                    cnt+=j;
                    cur++;
                }
                else if(arr[i][0]-mp.get(j).v>=mp.get(j).w){
                    mp.put(j, new edge(arr[i][0], arr[i][2]));
                    cur++;
                    cnt+=j;
                    a.add(j);
                }
            }
            if(cur!=arr[i][1]){
                System.out.println(-1);
                for(int j:a){
                    mp.remove(j);
                }
            }
            else System.out.println(cnt);
        }
    }
    static class edge{
        long v, w;
        edge(long v0, long w0){
            v = v0;
            w = w0;
        }
    }
    static String next () throws IOException {
        while (st == null || !st.hasMoreTokens())
                st = new StringTokenizer(input.readLine().trim());
        return st.nextToken();
    }
    static long readLong () throws IOException {
        return Long.parseLong(next());
    }
    static int readInt () throws IOException {
        return Integer.parseInt(next());
    }
    static double readDouble () throws IOException {
        return Double.parseDouble(next());
    }
    static char readChar () throws IOException {
        return next().charAt(0);
    }
    static String readLine () throws IOException {
        return input.readLine().trim();
    }
}
