if let N = Int(readLine() ?? ""),
   let input1 = readLine(), let input2 = readLine(),
   let A = input1.split(separator: " ").compactMap({Int($0)}) as? [Int],
   let B = input2.split(separator: " ").compactMap({Int($0)}) as? [Int],
   A.count == N, B.count == N
{
    let sortedA = A.sorted()
    let sortedB = B.sorted(by: >)
    
    var result: Int = 0
    for i in 0..<N {
        result += sortedA[i] * sortedB[i]
    }
    
    print(result)
}