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.PrintWriter;
import java.util.StringTokenizer;

public class C {
	public static void main(String[] args) throws IOException {
		FastScanner in= new FastScanner(System.in);
		PrintWriter out = new PrintWriter(System.out);
		int n= in.nextInt();
		int q= in.nextInt();
		int [] mach= new int[n+1];
		int prevtime =0 ;
		for (int i = 0; i < q; i++) {
			int t= in.nextInt();
			int k= in.nextInt();
			int d= in.nextInt();
			int diff= t-prevtime;
			int numavail=0;
			for (int j = 1; j < mach.length; j++) {
				if(mach[j]-diff<=0){
					mach[j]=0;
					numavail++;
				}
				else{
					mach[j]-=diff;
				}
			}
			
			
			if(numavail<k){
				out.println(-1);
				prevtime=t;
				continue;
			}
			else{
				int res=0;
				int count=0;
				for (int j = 1; j < mach.length&&count<k; j++) {
					if(mach[j]==0){
						res+=j;
						mach[j]=d;
						count++;
					}
				}
				out.println(res);
			}
			prevtime=t;
//			System.out.println(numavail);
//			for (int j = 0; j < mach.length; j++) {
//				System.out.print(mach[j]+" ");
//			}
//			System.out.println();
		}
		out.close();
		
	}
	static class FastScanner{
        BufferedReader br;
        StringTokenizer st;
        public FastScanner(InputStream in) throws IOException{
            br = new BufferedReader(new InputStreamReader(System.in));
            st = new StringTokenizer("");
        }
        public String next() throws IOException {
            if(st.hasMoreTokens())
                return st.nextToken();
            else
                st = new StringTokenizer(br.readLine());
            return next();
        }
        public int nextInt() throws IOException {
            return Integer.parseInt(next());
        }
        public long nextLong() throws IOException {
            return Long.parseLong(next());
        }
        public String nextLine() throws IOException {
            if(!st.hasMoreTokens())
                return br.readLine();
            String ret = st.nextToken();
            while(st.hasMoreTokens())
                ret += " " + st.nextToken();
            return ret;
        }
    }
}
