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

while True:
    try:
        caption = input().split()
        n = int(caption[0])
        servers = [i for i in range(1, n+1)]
        answer = []       
        q = int(caption[1])
        using = {}
        for i in range(q):
            
            tasks = input().split()
            time = int(tasks[0])
            key = int(tasks[0]) + int(tasks[2])
            for i in list(using.keys()):
                if time >= i:
                    servers += using[i]
                    servers.sort()
                    del using[i]
                    
            need = int(tasks[1])            
            touse = len(servers)
            if need > touse:
                answer.append(-1)
            else:               
                amount = servers[:need]
                servers = servers[need:]
                sums = sum(amount)
                if not using.get(key):
                    using[key] = amount
                else:
                    using[key] += amount

                answer.append(sums)
                

        for i in answer:
            print(i)
            
    except EOFError:
        break

	     	  	 		  	 	    		 		 	 	