#include <bits/stdc++.h>
#define L(i, j, k) for(int i = (j); i <= (k); i++)
#define R(i, j, k) for(int i = (j); i >= (k); i--)
#define ll long long
#define sz(a) ((int) a.size())
#define all(a) a.begin(), a.end()
#define vi vector<int>
#define pb emplace_back
#define me(a, x) memset(a, x, sizeof(a))
#define fst first
#define snd second
#define ii pair<int, int>
using namespace std;
long long min_total_length(std::vector<int> r, std::vector<int> b) {
int n=sz(r),m=sz(b);
ll ans=0;
L(i,0,min(m-1,n-1)){
ans+=b[i]-r[i];
}
L(i,n,m-1){
ans+=b[i]-r[n-1];
}
L(i,m,n-1){
ans+=r[i]-b[m-1];
}
return ans;
}
int main() {
int n, m;
assert(2 == scanf("%d %d", &n, &m));
vector<int> r(n), b(m);
for(int i = 0; i < n; i++)
assert(1 == scanf("%d", &r[i]));
for(int i = 0; i < m; i++)
assert(1 == scanf("%d", &b[i]));
long long res = min_total_length(r, b);
printf("%lld\n", res);
return 0;
}
