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.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.StringTokenizer;
public class C {
	public static void main(String[] args)throws Throwable {
		MyScanner sc=new MyScanner();
		PrintWriter pw=new PrintWriter(System.out,true);
		
		int n=sc.nextInt();
		int q=sc.nextInt();
		
		task [] arr=new task[q];
		
		for(int i=0;i<q;i++){
			int a=sc.nextInt(),b=sc.nextInt(),c=sc.nextInt();
			arr[i]=new task(a, b, c);
		}
		
		int [] last=new int [n];
		Arrays.fill(last, -1);
		boolean [] occ=new boolean [n];
		
		int [] ans=new int [q];
		for(int i=0;i<q;i++){
			int cntfree=0;
			task t1=arr[i];
			for(int j=0;j<n;j++){
				if(t1.t>last[j]){
					occ[j]=false;
				}
				if(!occ[j])
					cntfree++;
			}
			
			if(cntfree<t1.k)
				ans[i]=-1;
			else{
				int c=t1.k;
				int sumid=0;
				for(int j=0;j<n;j++){
					if(c==0)
						break;
					if(!occ[j]){
						occ[j]=true;
						sumid+=(j+1);
						c--;
						last[j]=t1.t+t1.d-1;
					}
				}
				ans[i]=sumid;
			}
		}
		
		for(int i=0;i<q;i++)
			pw.println(ans[i]);
		
		pw.flush();
		pw.close();
	}
	
	static class task{
		int t,d,k;
		
		task(int a,int b,int c){
			t=a;
			k=b;
			d=c;
		}
	}
	
	static class MyScanner {
	      BufferedReader br;
	      StringTokenizer st;
	 
	      public MyScanner() {
	         br = new BufferedReader(new InputStreamReader(System.in));
	      }
	 
	      String next() {
	          while (st == null || !st.hasMoreElements()) {
	              try {
	                  st = new StringTokenizer(br.readLine());
	              } catch (IOException e) {
	                  e.printStackTrace();
	              }
	          }
	          return st.nextToken();
	      }
	 
	      int nextInt() {
	          return Integer.parseInt(next());
	      }
	 
	      long nextLong() {
	          return Long.parseLong(next());
	      }
	 
	      double nextDouble() {
	          return Double.parseDouble(next());
	      }
	 
	      String nextLine(){
	          String str = "";
		  try {
		     str = br.readLine();
		  } catch (IOException e) {
		     e.printStackTrace();
		  }
		  return str;
	      }

	   }
}
