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>
#pragma GCC optimize("Ofast")
#pragma GCC optimization("O3")
#pragma GCC optimization("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using namespace std;
clock_t time_p = clock();
void Satyam() {
  time_p = clock() - time_p;
  cerr << "Time_Taken : " << (float)(time_p) / CLOCKS_PER_SEC << "\n";
}
vector<int> v;
int N = 1000000;
void prime() {
  bool prime[N + 1];
  memset(prime, true, sizeof(prime));
  for (int i = 2; i * i <= N; ++i) {
    if (prime[i]) {
      for (int j = i * i; j <= N; j += i) {
        prime[j] = false;
      }
    }
  }
  for (int i = 2; i <= N; ++i) {
    if (prime[i]) {
      v.push_back(i);
    }
  }
}
void solve() {
  long long n;
  long long l;
  cin >> n;
  cin >> l;
  long long arr[n + 1];
  memset(arr, 0, sizeof(arr));
  while (l--) {
    long long t, k, d;
    cin >> t >> k >> d;
    long long r = 0;
    for (long long i = 1; i < n + 1; i++) {
      if (arr[i] < d + t) {
        r++;
      }
      if (r >= k) {
        break;
      }
    }
    if (r < k) {
      cout << -1 << "\n";
      continue;
    } else {
      r = 0;
      long long ans = 0;
      for (long long i = 1; i < n + 1; i++) {
        if (arr[i] < t) {
          ans = ans + i;
          r++;
          arr[i] = d + t;
        }
        if (r >= k) {
          break;
        }
      }
      cout << ans << "\n";
    }
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  solve();
  Satyam();
}
