a=[]
t,f,i=0,0,1
while i<=7:
    c,b = map(int, input().split())
    a.append(c)
    a.append(b)
    i += 1
i=0
while i<14:
    if i%2==0 and t==0 and a[i]+a[i+1]>8:
        f=i//2+1
        t=1
    i+=1
print(f)