N = int(raw_input())

A =  raw_input()
A = A.split()
for i in range(len(A)):
    A[i]=int(A[i]) 
    
B =  raw_input()
B = B.split()
for i in range(len(B)):
    B[i]=int(B[i]) 
    

leng=N

result = False
while not result and leng>0:
    for i in range(0,N-leng+1):
        if sum(A[i:i+leng])==sum(B[i:i+leng]):
           result=True
    if not result:
        leng=leng-1

if result:
    print leng
else:
    print 0