#include<bits/stdc++.h> using namespace std; int n,m,i,j,s,ma; int main(){ cin>>n>>m; int a[n],b[m]; for(i=1;i<=n;i++){ cin>>a[i]; } for(i=1;i<=m;i++){ cin>>b[i]; ma=100000; for(j=1;j<=n;j++){ if(b[i]>a[j]){ if(ma>b[i]-a[j]){ ma=b[i]-a[j]; } }else{ if(ma>a[j]-b[i]){ ma=a[j]-b[i]; } } } s+=ma; } cout<<s; }