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.*;
import java.util.*;
import java.math.*;
public class Main
{
	public static void main(String[] args)throws Exception
	{
	    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
	    PrintWriter pw=new PrintWriter(System.out);
	    String s[]=(br.readLine()).split(" ");
	    int n=Integer.parseInt(s[0]);
	    int q=Integer.parseInt(s[1]);
	    int free=n;
	    int a[]=new int[n+1];
	    a[0]=0;
	    for(int i=1;i<=n;i++)
	    {
	        a[i]=i;
	    }
	    while(q-->0)
	    {
	        String s1[]=(br.readLine()).split(" ");
	        int t=Integer.parseInt(s1[0]);
	        int k=Integer.parseInt(s1[1]);
	        int d=Integer.parseInt(s1[2]);
	        
	            int sum=0;
	            for(int i=1;i<=n;i++)
	            {
	                if(a[i]<0)
	                {
	                    if(t>(-1*a[i]))
	                    {
	                        a[i]=i;
	                        free++;
	                    }
	                }
	                if(a[i]>0)
	                {
	                   sum+=a[i];
	                    free--;
	                    k--;
	                    a[i]=t+d-1;
	                    a[i]*=-1;
	                    if(k<=0)
	                    {
	                        break;
	                    }
	                }
	            }
	            if(k==0)
	            {
	                pw.println(sum);
	            }
	        
	            else
	            {
	                pw.println(-1);
	                
	            }
	        
	    }
	    pw.flush();
	    
	}
}
