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.*;

public class CF747C {
	public static void main(String[] args) throws IOException
	{
		BufferedReader fin = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer(fin.readLine());
		int N = Integer.parseInt(st.nextToken());
		int Q = Integer.parseInt(st.nextToken());
		triple[] tasks = new triple[Q];
		
		for(int i = 0; i < Q; i++)
		{
			st = new StringTokenizer(fin.readLine());
			tasks[i] = new triple();
			tasks[i].start = Integer.parseInt(st.nextToken());		// time task starts
			tasks[i].number = Integer.parseInt(st.nextToken());		// number of servers needed
			tasks[i].duration = Integer.parseInt(st.nextToken());		// duration of task
		}
		
		int available = N;
		ArrayList<triple> list = new ArrayList<triple>();
		ArrayList<triple> remove = new ArrayList<triple>();
		for(int i = 0; i < Q; i++)
		{
			for(triple T : list)
			{
				if(tasks[i].start >= T.start + T.duration)
				{
					available += T.number;
					remove.add(T);
				}
			}
			
			for(int j = 0; j < remove.size(); j++)
			{
				list.remove(remove.get(j));
			}
			remove.clear();
			
			if(available >= tasks[i].number)
			{
				available -= tasks[i].number;
				System.out.println((N - available + N - available - tasks[i].number + 1) * tasks[i].number / 2);
				list.add(tasks[i]);
			}
			else
			{
				System.out.println(-1);
			}
		}
	}
}

class triple
{
	int start;
	int number;
	int duration;
}
