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

n,q = map(int,raw_input().split())
occ = []
emp = [[1,n]]
for ex in xrange(q):
    occ.sort()
    t,k,d = map(int,raw_input().split())
    rm = []
    emp = map(list, set(map(tuple, emp)))
    occ = map(list, set(map(tuple, occ)))
    for i in xrange(len(occ)):
        if occ[i][2]<=t:
            rm.append(i)
            m = len(emp)
            if m>0:
                flag = 0
                for j in xrange(m):
                    if emp[j][0]==occ[i][1]+1:
                        emp[j][0]=occ[i][0]
                        flag=1
                        break
                    elif emp[j][1]+1==occ[i][0]:
                        emp[j][1]=occ[i][1]
                        flag=1
                        break
                if flag==0:
                    emp.append([occ[i][0],occ[i][1]])
            else:
                emp.append([occ[i][0],occ[i][1]])
    rm.reverse()
    for i in rm:
        occ.pop(i)
    #emp = [list(t) for t in set(map(tuple, emp))]
    emp = map(list, set(map(tuple, emp)))
    occ = map(list, set(map(tuple, occ)))
    emp.sort()
    while True:
        yes = 0
        x = []
        for i in xrange(1,len(emp)):
            if emp[i][0]==emp[i-1][1]+1:
                yes = 1
                emp.append([emp[i-1][0],emp[i][1]])
                x.append(i-1)
                x.append(i)
        x.reverse()
        for i in x:
            emp.pop(i)
        if yes == 0:
            break     
    flag=0
    #print occ," - ",emp
    #emp = [list(t) for t in set(map(tuple, emp))]
    emp = map(list, set(map(tuple, emp)))
    occ = map(list, set(map(tuple, occ)))
    emp.sort()
    l = []
    ans=0
    for i in xrange(len(emp)):
        if emp[i][1]-emp[i][0]+1>k:
            occ.append([emp[i][0],emp[i][0]+k-1,t+d])
            emp[i][0] = emp[i][0]+k 
            print ((occ[-1][1]*(occ[-1][1]+1))/2) - (((occ[-1][0]-1)*occ[-1][0])/2)+ans
            flag=1
            break
        elif emp[i][1]-emp[i][0]+1 == k:
            occ.append([emp[i][0],emp[i][0]+k-1,t+d])
            l.append(i)
            print ((occ[-1][1]*(occ[-1][1]+1))/2) - (((occ[-1][0]-1)*occ[-1][0])/2)+ans
            flag=1
            break
        else:
            occ.append([emp[i][0],emp[i][1],t+d])
            k-=(emp[i][1]-emp[i][0]+1)
            l.append(i)
            ans +=  ((emp[i][1]*(emp[i][1]+1))/2) - (((emp[i][0]-1)*emp[i][0])/2)
    if flag==0:
        print "-1"   
    else:
        l.sort()
        l.reverse()
        for i in l:
            emp.pop(i)
        #print occ," - ",emp