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.Scanner;

public class SolutionC {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int serverNumber = sc.nextInt();
        int requestNumber = sc.nextInt();
        int[][] requests = new int[requestNumber][3];
        int[] serverWorkDuration = new int[serverNumber];
        for (int i = 0; i < requestNumber; i++) {
            for (int j = 0; j < 3; j++) {
                requests[i][j] = sc.nextInt();
            }
        }
        int serverNumberSum = 0;
        int freeServers = serverNumber;
        if (freeServers >= requests[0][1]) {
            for (int j = 0; j < requests[0][1]; j++) {
                serverWorkDuration[j] = requests[0][2];
                serverNumberSum += j + 1;
            }
            System.out.println(serverNumberSum);
        } else {
            System.out.println("-1");
        }

        serverNumberSum = 0;
        int loadedServersCounter = 0;

        for (int i = 1; i < requestNumber; i++) {
            freeServers = 0;
            for (int j = 0; j < serverNumber; j++) {
                serverWorkDuration[j] -= requests[i][0] - requests[i - 1][0];
                if (serverWorkDuration[j] <= 0) {
                    serverWorkDuration[j] = 0;
                    freeServers++;
                }
            }

            if (freeServers < requests[i][1]) {
                System.out.println("-1");
                continue;
            }

            for (int j = 0; j < serverNumber; j++) {
                if (loadedServersCounter == requests[i][1]) {
                    break;
                }
                if (serverWorkDuration[j] > 0) {
                    continue;
                } else {
                    serverWorkDuration[j] = requests[i][2];
                    serverNumberSum += j + 1;
                    loadedServersCounter++;
                }
            }
            System.out.println(serverNumberSum);
            serverNumberSum = 0;
            loadedServersCounter = 0;
        }
        sc.close();
    }
}
