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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.PriorityQueue;


public class Main2 {
    public static void main(String[] args) throws IOException
    {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int n, q, t, k, d;
        String lines[] = in.readLine().split("\\s+");
        
        n = Integer.parseInt(lines[0]);
        q = Integer.parseInt(lines[1]);
        PriorityQueue<Integer> server = new PriorityQueue<Integer>();
        for( int i = 1; i <= n; i++ ) server.add(i);
        int ocu[] = new int[n+1];
        int sumO;
        StringBuilder out = new StringBuilder("");
        for( int i = 0; i < q; i++ )
        {
            lines = in.readLine().split("\\s+");
            t = Integer.parseInt(lines[0]);
            k = Integer.parseInt(lines[1]);
            d = Integer.parseInt(lines[2]);
            
            
            sumO = 0;
            for( int j = 1; j <= n; j++ )
            {
                if ( ocu[j] < t ) sumO++;
            }
            if ( sumO < k )
            {
                out.append("-1\n");
                continue;
            }
            
            sumO = 0;
            for( int j = 1; j <= n & k > 0; j++ )
            {
                if ( ocu[j] < t ) 
                {
                    sumO += j;
                    k--;
                    ocu[j] = t+d-1;
                }
            }
             out.append(sumO+"\n");
            
            
        }
        System.out.print(out);
        
        
    }
}
