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.*;
import java.io.*;

public class CF747C{ 
  public static int index;
  public static void main(String[] args)throws Exception {
    InputReader in = new InputReader(System.in);
    PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));
    int n = in.nextInt(), q = in.nextInt();
    
    int a[] = new int[n+1];
    
    for(int j = 0; j < q; j++){
      int t = in.nextInt(), k = in.nextInt(), d = in.nextInt();
      int sum = 0, cnt = 0;
      
      for(int i = 1; i <= n; i++){
        if(a[i] < t) cnt++;
        if(cnt >= k) break;
      }
      //System.err.println(cnt+" "+d+"  "+Arrays.toString(a));
      if(cnt < k) pw.println(-1); 
      else{
        cnt = 0;
        for(int i = 1; i <= n; i++){
          if(a[i] < t){ sum += i; cnt++; a[i] = t+d-1;}
          if(cnt >= k) break;
        }
        pw.println(sum);
      }
    }
    
    
    pw.close();
  }
  
  static class InputReader {
    public BufferedReader reader;
    public StringTokenizer tokenizer;
    
    public InputReader(InputStream stream) {
      reader = new BufferedReader(new InputStreamReader(stream));
      tokenizer = null;
    }
    
    public String next()throws Exception {
      while (tokenizer == null || !tokenizer.hasMoreTokens())
        tokenizer = new StringTokenizer(reader.readLine());
      return tokenizer.nextToken();
    }
    
    public String nextLine()throws Exception {
      String line = null;
      tokenizer = null;
      line =  reader.readLine();
      return line;
    }
    
    public int nextInt()throws Exception {
      return Integer.parseInt(next());
    }
    
    public double nextDouble() throws Exception{
      return Double.parseDouble(next());
    }
    
    public long nextLong()throws Exception {
      return Long.parseLong(next());
    }
    
  }
}