USACO 2021 Bronze January P3: Just Stalling

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N = int(input())
cows = list(map(int, input().split()))
stalls = list(map(int, input().split()))
ans = 1
cows.sort(reverse=True)
stalls.sort(reverse=True)
stallsCanBeIn = [0] * N

for i in range(N):
    for stall in stalls:
        if stall >= cows[i]:
            stallsCanBeIn[i] += 1
i = 0
for stall in stallsCanBeIn:
    ans *= stall - i
    i += 1