dot_product

# Uses python3
import sys


def max_dot_product(p, q):
    # we just sort the two lists
    p.sort()
    q.sort()
    res = 0
    # and multiply them dot for dot
    for i in range(len(p)):
        res += p[i] * q[i]
    return res


if __name__ == '__main__':
    user_input = sys.stdin.read()
    data = list(map(int, user_input.split()))
    n = data[0]
    a = data[1:(n + 1)]
    b = data[(n + 1):]
    print(max_dot_product(a, b))