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.LinkedList;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Scanner;
import java.util.Stack;

public class Servers implements Comparable<Object>
{
	int id;
	int available;
	public Servers(int i)
	{
		id = i;
	}
	public void putAvail(int t)
	{
		available = t;
	}
	public boolean isAvail(int t)
	{
		return t >= available;
	}
	public int getID()
	{
		return id;
	}
	public int compareTo(Object arg0)
	{
		Servers x = (Servers) arg0;
		if(getID() < x.getID())
			return -1;
		if(getID() == x.getID())
			return 0;
		return 1;
	}
	public static void perform(Queue<Operation> x, LinkedList<Servers> y)
	{
		int sum;
		Operation tmp;
		while(!x.isEmpty())
		{
			sum = 0;
			tmp = (Operation) x.remove();
			sum = tmp.sumServers(sum, y, tmp.numberAsis(), tmp.time+tmp.duration);
			System.out.println(sum == 0? -1 : sum);
		}
	}
	public static void main (String [] args)
	{
		Scanner scan = new Scanner(System.in);
		int[] stats = new int[2];
		stats[0]= scan.nextInt();
		stats[1]= scan.nextInt();
		LinkedList<Servers> servers = new LinkedList<Servers>();
		Queue<Operation> opr = new LinkedList<Operation>();;
		for (int i = 1; i <= stats[0]; i++)
		{
			servers.add(new Servers(i));
		}
		for (int i = 0; i < stats[1]; i++)
		{
			opr.add(new Operation(scan.nextInt(),scan.nextInt(),scan.nextInt()));
		}
		perform(opr,servers);
	
	}
}
class Operation
{
	int time;
	int assistants;
	int duration;
	public Operation(int x, int y, int z)
	{
		time = x;
		assistants = y;
		duration = z;
	}
	public int numberAsis()
	{
		return assistants;
	}
	public int sumServers(int sum,LinkedList<Servers> y,int count,int available)
	{
		Servers tmp= null;
		int recount = count;
		for(int i = 0;count != 0 && i < y.size(); i++)
		{
			tmp = (Servers)y.get(i);
			if(tmp.available <= time)
			{	
				sum += tmp.getID();
				count--;
			}
		}
		if(count != 0)
			return -1;
		else
		{	
			if(tmp != null)
				for(int i = 0;i < y.size();i++)
				{
					tmp = (Servers)y.get(i);
					if(tmp.available <= time)
					{	
						tmp.available = available;
						recount--;
					}
					if(recount == 0)
						break;
				}
		}
		return sum;
	}
}