t = []
for i in range(7):
    t1,t2 = 0,0
    t1,t2 = map(int,input().split())
    t.append(t1 + t2)
for i in range(len(t)):
    if t[i] > 8:
        print(i+1)
        break
else:print(0)

求大佬指点