f=open('2023.02.27_22.csv')
d={}
for line in f:
	p=line.replace('"','').strip().split(';')
	p=list(map(int, p))
	d[p[0]]=p[1:]

times = {}

for proc_id in d:
	proc_time = d[proc_id][0]
	dep = d[proc_id][1:]
	total_time = proc_time

	max_time = 0
	if d[proc_id][1] != 0:
		for pid in dep:
			max_time = max(times[pid], max_time)

	times[proc_id] = total_time + max_time

print(max(list(times.values())))