w = {}
with open('t.txt') as trans_file:
    for l in trans_file:
        f,t,a = l.split(',')
        w[f] = w.get(f, 0) - int(a)
        w[t] = w.get(t, 0) + int(a)

x = len([x for x in w if w[x] > 10])
print(x)