C++ :

#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int N;
    cin >> N;
    vector<int> p(N + 1), t(N + 1), d(N + 2);
    for (int i = 1; i <= N; ++i)
        cin >> p[i];
    for (int i = 1; i <= N; ++i)
        cin >> t[i];
    for (int i = 1; i <= N; ++i)
        d[i] = p[i] - t[i];
    int ans = 0;
    for (int i = 0; i <= N; ++i)
        ans += abs(d[i] - d[i + 1]);
    cout << ans / 2;
    return 0;
}