import numpy as np
N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))

C = [0] * len(A)

for b in B:
    D = [i for i, x in enumerate(A) \
         if x == min(A)]
    C_ = [C[x] for x in D]
    T = [x for x in D if C[x] == min(C_) and A[x]  == min(A)]
    idx = T[0]
    A[idx] += (b//2)
    C[idx] += 1
    
print(max(C))