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 com.sun.org.apache.bcel.internal.generic.BIPUSH;

import java.util.ArrayList;
import java.util.BitSet;
import java.util.Scanner;

/**
 * Created by Luis Ngo on 22/12/2016.
 */
public class P747C {
    public static void main (String[] args){
        Scanner  scanner =  new Scanner(System.in);
        int n =  scanner.nextInt();
        int q =  scanner.nextInt();
        ArrayList<BitSet> servers = new ArrayList<>();
        for (int i = 0 ; i < n ; i++){
            BitSet bitSet = new BitSet();
            servers.add(bitSet);
        }
        for (int i = 0; i < q; i++){
            int startTime = scanner.nextInt();
            int numServer = scanner.nextInt();
            int duration = scanner.nextInt();
            calculate(n, servers, startTime, numServer, duration);
        }
    }
    private static void calculate(int n, ArrayList<BitSet> servers, int startTime, int numServer, int duration) {
        ArrayList<Integer> availableServer =  new ArrayList<>();
        for (int x = 0; x < n; x++){
            if (!servers.get(x).get(startTime)){
                availableServer.add(x);
            }
            if (availableServer.size() == numServer) break;
        }
        if (availableServer.size() < numServer) System.out.println(-1);
        else{
            int sum = 0;
            for (int y = 0 ; y< availableServer.size(); y++){
                int temp = availableServer.get(y);
                sum += (temp+1);
                servers.get(temp).set(startTime,startTime+duration);
            }
            System.out.println(sum);
        }
    }
}
