#include <bits/stdc++.h>
#define endl '\n'
#define int long long
#define x first
#define y second
#define pb push_back
using namespace std;
typedef pair<int, int> PII;

void solve() {
    int n, m, ans = 0;
    cin >> n >> m;
    vector<int> a(n + 1), b(m + 1);
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 1; i <= m; i++) cin >> b[i];
    for (int i = 2; i <= n; i++) ans += abs(a[i] - a[i - 1]);
    for (int i = 2; i <= m; i++) ans += abs(b[i] - b[i - 1]);
    cout << ans << endl;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    // cin >> t;
    while (t--) solve();
    return 0;
}