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.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class C387 {
  
  public void solve() throws IOException {
    int n = nextInt();
    int q = nextInt();
    
    int[] used = new int[n];
    int[] ans = new int[q];
    
    int[] machines = new int[n];
    for (int i = 0; i < q; i++) {
      int t = nextInt();
      int k = nextInt();
      int d = nextInt();
      
      int total = 0;
      for (int j = 0; j < n; j++) {
        if (used[j] < t) {
          machines[total++] = j;
          if (total == k) {
            break;
          }
        }
      }
      
      if (total < k) {
        ans[i] = -1;
      } else {
        int sum = 0;
        for (int j = 0; j < total; j++) {
          used[machines[j]] = t + d - 1;
          sum += machines[j] + 1;
        }
        ans[i] = sum;
      }
    }
    
    for (int i = 0; i < q; i++) {
      System.out.println(ans[i]);
    }
  }

  public BufferedReader br;
  public StringTokenizer st;
  public PrintWriter out;

  public String nextToken() throws IOException {
    while (st == null || !st.hasMoreTokens()) {
      st = new StringTokenizer(br.readLine());
    }

    return st.nextToken();
  }

  public String nextLine() throws IOException {
    return br.readLine();
  }

  public int nextInt() throws IOException {
    return Integer.parseInt(nextToken());
  }

  public long nextLong() throws IOException {
    return Long.parseLong(nextToken());
  }

  public double nextDouble() throws IOException {
    return Double.parseDouble(nextToken());
  }

  public void run() throws IOException {
    boolean oj = System.getProperty("ONLINE_JUDGE") != null;
    oj = true;
    br = new BufferedReader(
        new InputStreamReader(oj ? System.in : new FileInputStream("input.txt")));
    out = new PrintWriter(oj ? System.out : new FileOutputStream("output.txt"));
    solve();
    out.close();
  }

  public static void main(String[] args) throws IOException {
    new C387().run();
  }
}
