Devu and his brother love each other a lot. As they are super geeks, they only like to play with arrays. They are given two arrays *a* and *b* by their father. The array *a* is given to Devu and *b* to his brother. 

As Devu is really a naughty kid, he wants the minimum value of his array *a* should be at least as much as the maximum value of his brother's array *b*. 

Now you have to help Devu in achieving this condition. You can perform multiple operations on the arrays. In a single operation, you are allowed to decrease or increase any element of any of the arrays by 1. Note that you are allowed to apply the operation on any index of the array multiple times.

You need to find minimum number of operations required to satisfy Devu's condition so that the brothers can play peacefully without fighting.
The first line contains two space-separated integers *n*, *m* (1 ≤ *n*, *m* ≤ 10<sup class="upper-index">5</sup>). The second line will contain *n* space-separated integers representing content of the array *a* (1 ≤ *a*<sub class="lower-index">*i*</sub> ≤ 10<sup class="upper-index">9</sup>). The third line will contain *m* space-separated integers representing content of the array *b* (1 ≤ *b*<sub class="lower-index">*i*</sub> ≤ 10<sup class="upper-index">9</sup>).
'''
    Auther: ghoshashis545 Ashis Ghosh
    College: jalpaiguri Govt Enggineering College

'''
from os import path
import sys
from heapq import heappush,heappop
from functools import cmp_to_key as ctk
from collections import deque,defaultdict as dd 
from bisect import bisect,bisect_left,bisect_right,insort,insort_left,insort_right
from itertools import permutations
from datetime import datetime
from math import ceil,sqrt,log,gcd
def ii():return int(input())
def si():return input().rstrip()
def mi():return map(int,input().split())
def li():return list(mi())
abc='abcdefghijklmnopqrstuvwxyz'
mod=1000000007
# mod=998244353
inf = float("inf")
vow=['a','e','i','o','u']
dx,dy=[-1,1,0,0],[0,0,1,-1]

def bo(i):
    return ord(i)-ord('a')

file=1


 
def solve():


    n,m=mi()
    a=li()
    b=li()
    a.sort()
    b.sort()
    if b[-1]<=a[0]:
        print(0)
        exit(0)
    pre=[0]*n
    for i in range(1,n):
        pre[i]+=pre[i-1]
        pre[i]+=i*(a[i]-a[i-1])

    suff=[0]*m
    for i in range(m-2,-1,-1):
        suff[i]+=suff[i+1]
        suff[i]+=(m-i-1)*(b[i+1]-b[i])

    def fun(m1):
        x=bisect(a,m1)-1
        y=bisect(b,m1)-1
        ans=0
        if x==n:
            x-=1
        ans+=pre[x]
        ans+=(m1-a[x])*(x+1)
        # print(x,ans)
        if y>=(m-1):
            return ans
        if y==0:
            y-=1
        ans+=(b[y+1]-m1)*(m-y-1)
        ans+=suff[y+1]
        return ans
    
    
    l=1
    r=int(1e9+5)
    while(l<=r):
        mid=l+(r-l)//2
        x=fun(mid)
        if mid==1:
            x1=fun(mid+1)
            if(x>x1):
                l=mid+1
                ans=x1
            else:
                # print(mid)
                print(max(x,0))
                exit(0)

        x1=fun(mid-1)
        x2=fun(mid+1)
        if(x1<x2):
            if(x1<x):
                r=mid-1
                ans=x1
            else:
                # print(mid)
                print(max(x,0))
                exit(0)
        else:
            if(x2<x):
                l=mid+1
            else:
                # print(mid)
                print(max(x,0))
                exit(0)
    



    










        
if __name__ =="__main__":

    if(file):

        if path.exists('input.txt'):
            sys.stdin=open('input.txt', 'r')
            sys.stdout=open('output.txt','w')
        else:
            input=sys.stdin.readline
    solve()