#include <bits/stdc++.h>
using namespace std;
 
int n,q,t,k,d;
int Time[105],stmp,cnt;
 
int main()
{
//    freopen("nhap.inp", "r", stdin);
    cin>>n>>q;
    for (int i=1; i <= q; i++)
    {
        scanf("%d %d %d",&t,&k,&d);
        stmp=cnt=0;
        for (int j=1; j<=n; j++)
            if (Time[j]<=t) cnt++;
        if (cnt<k) { printf("-1\n"); continue; }
        cnt=0;
        for (int j=1; j<=n; j++)
        {
            if (Time[j]<=t)
            {
                stmp+=j;
                Time[j]=t+d;
                cnt++;
                if (cnt==k) break;
            }
        }
        printf("%d\n",stmp);
    }
    return 0;
}