---

f = open('fff.txt')
a = {}

for s in f:
    x = s.split()
    if len(x) >= 3 and x[0].isdigit():
        a[int(x[0])] = (int(x[1]), x[2])

end = {}

def finish(i):
    if i not in end:
        t, deps = a[i]
        if deps == '0':
            start = 1
        else:
            start = max(finish(int(j)) for j in deps.split(';')) + 1
        end[i] = start + t - 1
    return end[i]

count = 0

for i in a:
    finish(i)
    t, deps = a[i]
    start = end[i] - t + 1

    if start <= 7 <= end[i]:
        count += 1

print(count)