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.*;
import java.util.*;
public class P747C
{
    public static void main(String[] args)
    {
        Scanner s= new Scanner(System.in);
        int numServers = s.nextInt();
        int numTasks = s.nextInt();
        int[] serverWorkTo = new int[numServers];
        for (int i = 0; i < numTasks; i++)
        {
                int time = s.nextInt();
                int serversNeeded = s.nextInt();
                //save this if needed
                int timeNeeded= s.nextInt();
                
                //updateArray, check for available servers
                int availableServers = 0;
                for (int index = 0; index < numServers; index++)
                {
                    if (time >= serverWorkTo[index])
                    {
                        serverWorkTo[index] = 0;
                        availableServers++;
                    }
                }
                if (availableServers >= serversNeeded)
                {
                    int index = 0;
                    int sumOfWorking = 0;
                    while (serversNeeded > 0)
                    {
                        if (serverWorkTo[index] == 0)
                        {
                            serverWorkTo[index] = time + timeNeeded;
                            sumOfWorking = sumOfWorking + index + 1;
                            serversNeeded--;
                        }
                        index++;
                    }
                    System.out.println(sumOfWorking);
                }
                else
                {
                    System.out.println("-1");
                }
        }
    }
}
