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.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class C747 {

  public static void main(String[] args){
    InputStream inputStream = System.in;
    OutputStream outputStream = System.out;
    InputReader in = new InputReader(inputStream);
    PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));

    Solver solver = new Solver();
    solver.solve(in, out);
    out.close();
  }

  static class Solver {

    InputReader in;
    PrintWriter out;

    int n, q;

    int[] serversTime = new int[101];

    public void solve(InputReader in, PrintWriter out) {
      this.in = in;
      this.out = out;

      n = in.readInt();
      q = in.readInt();

      for (int i = 0; i < q; i++){
        int ti = in.readInt();
        int ki = in.readInt();
        int di = in.readInt();

        if (free(ti, ki))
          out.println(addTaskWithSum(ti, ki, di));
        else
          out.println(-1);
      }
    }

    private int addTaskWithSum(int t, int k, int d){
      int sum = 0;
      for (int s = 1; s <= n; s++){
        if (serversTime[s] <= t) {
          serversTime[s] = t + d;
          sum += s;
          k--;
          if (k == 0) return sum;
        }
      }
      // should not happen
      return Integer.MAX_VALUE;
    }

    private boolean free(int t, int k){
      for (int s = 1; s <= n; s++){
        if (serversTime[s] <= t) {
          k--;
          if (k == 0) return true;
        }
      }
      return false;
    }
  }


  static class InputReader {
    private BufferedReader reader;
    private StringTokenizer tokenizer;

    public InputReader(InputStream stream) {
      this.reader = new BufferedReader(new InputStreamReader(stream));
    }

    public String read() {
      try {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
          tokenizer = new StringTokenizer(reader.readLine());
        }
      } catch (IOException ex) {
        throw new RuntimeException(ex);
      }
      return tokenizer.nextToken();
    }

    public int readInt() {
      return Integer.parseInt(read());
    }

    public long readLong() {
      return Long.parseLong(read());
    }

    public void readIntArrays(int[]... arrays) {
      for (int i = 0; i < arrays[0].length; i++) {
        for (int j = 0; j < arrays.length; j++) {
          arrays[j][i] = readInt();
        }
      }
    }
  }
}
