bomul.py

n = int(input())
a = [
    int(x)
    for x in input().split(" ")
]
b = [
    int(x)
    for x in input().split(" ")
]
#a = [1, 1, 1, 6, 0]
#b = [2, 7, 8, 3, 1]
assert len(a) == len(b) == n

sorted_a = sorted([(x, i) for i, x in enumerate(a)])
sorted_b = sorted([(x, i) for i, x in enumerate(b)], reverse=True)

print(
    sum(
        x * sorted_a[sorted_b.index((x, i))][0]
        for i, x in enumerate(b)
    )
)