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.lang.*;
import java.io.*;

public final class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
		int servers = sc.nextInt();
		int tasks = sc.nextInt();
		int[] serverBT = new int[servers];
		while(tasks-- > 0) {
			int arrival = sc.nextInt();
			int serversN = sc.nextInt();
			int executionT = sc.nextInt();
			ArrayList<Integer> list = new ArrayList<Integer>();
			for(int i = 0 ; i < servers && serversN > 0; i++) {
				if(serverBT[i] <= arrival) {
					list.add(i);
					serversN--;
				}
			}
			if (serversN > 0) {
				System.out.println(-1);
			} else {
				Iterator<Integer> itr = list.iterator();
	    		int sum = 0;
	    		while (itr.hasNext()) {
	      			Integer element = itr.next();
	      			serverBT[element] = arrival + executionT;
	      			sum += element + 1;
	    		}
	    		System.out.println(sum);
			}
    	}
	}
}