#!/usr/bin/env python3.8
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

# %%
N = int(readline())
A = tuple(map(int, readline().split()))
B = tuple(map(int, readline().split()))
D = tuple(sorted(map(int, readline().split())))

# %%


def test(n):
    difficulty = D[:n][::-1]
    dp = [0] * (n + 1)
    dp[0] = 1
    for j in range(1, n + 1):
        if A[0] + B[j] >= difficulty[j - 1]:
            dp[j] = 1
        else:
            break
    if dp[-1]:
        return True
    for i in range(1, n + 1):
        dp.pop()
        for j in range(n - i + 1):
            if not dp[j]:
                continue
            if A[i] + B[j] < difficulty[i + j - 1]:
                dp[j] = 0
                continue
            if j < n - i:
                dp[j + 1] = 1
        if dp[-1]:
            return True
    return False


# %%
left = 0
right = N + 1
while left + 1 < right:
    x = (left + right) // 2
    if test(x):
        left = x
    else:
        right = x
print(left)