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

#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  long n, m;
  while (cin >> n >> m) {
    long p, q, w, cc, pp, x, i, j, dd;
    long vc[10010], vt[10010];
    for (int i = 0; i < m; i++) {
      cin >> p >> q >> w;
      x = p + w - 1;
      cc = 0;
      dd = 0;
      for (j = 1; j <= n; j++) {
        if (vc[j] <= p && vt[j] >= p || vc[j] <= x && vt[j] >= x) {
          pp = 1;
        } else
          cc++;
      }
      if (cc >= q) {
        cc = q;
        for (j = 1; j <= n; j++) {
          if (vc[j] <= p && vt[j] >= p || vc[j] <= x && vt[j] >= x) {
            pp = 1;
          } else {
            cc--;
            dd += j;
            vc[j] = p;
            vt[j] = x;
          }
          if (cc == 0) {
            cout << dd << "\n";
            break;
          }
        }
      } else
        cout << "-1\n";
    }
  }
  return 0;
}
