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.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.StringTokenizer;

public class Servers {
	static class Task implements Comparable<Task> {
		int t, k, d;
		Task(int a, int b, int c) {
			t = a; k = b; d = c;
		}
		@Override
		public int compareTo(Task tk) {
			return t - tk.t;
		}
	}
	public static void main(String[] args) throws NumberFormatException, IOException {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int q = sc.nextInt();
		
		int free[] = new int[n];
		Arrays.fill(free, 1);
		Task[] tk = new Task[q];
		for(int i = 0; i < q; i++) {
			tk[i] = new Task(sc.nextInt(), sc.nextInt(), sc.nextInt());
		}
		
		Arrays.sort(tk);
		
		PrintWriter out = new PrintWriter(System.out);
		
		for(int i = 0; i < q; i++) {
			ArrayList<Integer> servers = new ArrayList<Integer>();
			for(int j = 0; j < n; j++) {
				if(free[j] <= tk[i].t)
					servers.add(j + 1);
				if(servers.size() == tk[i].k)
					break;
			}
			
			if(servers.size() < tk[i].k)
				out.println(-1);
			else {
				for(int s : servers)
					free[s - 1] = tk[i].t + tk[i].d;
				out.println(sum(servers));
			}
		}
		out.flush();
		out.close();
	}
	private static int sum(ArrayList<Integer> a) {
		int sum = 0;
		for(int x : a)
			sum += x;
		return sum;
	}
	
	static class Scanner {
		BufferedReader br;
		StringTokenizer st;

		Scanner(FileReader f) {
			br = new BufferedReader(f);
		}

		public boolean ready() throws IOException {
			return br.ready();
		}

		Scanner(InputStream s) {
			br = new BufferedReader(new InputStreamReader(s));
		}

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

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

		int nextInt() throws NumberFormatException, IOException {
			return Integer.parseInt(next());
		}

		long nextLong() throws NumberFormatException, IOException {
			return Long.parseLong(next());
		}
	}
}
