943 B | 927 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
BLANK = " "
#inp = input
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def f(speed, read_time, rest_time, page):
cnt_read_time = page // (speed * read_time)
ret = (read_time + rest_time) * cnt_read_time
left_page = page % (speed * read_time)
ret += (left_page + speed - 1) // speed
if left_page == 0 and page != 0:
ret -= rest_time
return ret
def solve():
N, K = mii() # N 페이지의 책,K 마리 소
for i in range(K):
speed, read_time, rest_time = mii()
total = f(speed, read_time, rest_time, N)
p(ceil(total))
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()