#include<iostream>
#include<cstdio>

using namespace std;

const int N = 100010;

int n;
int b[N];

int main()
{
    scanf("%d", &n);
    for(int i = 1;i <= n;i ++) scanf("%d", &b[i]);
    for(int i = 1;i <= n;i ++)
    {
        int x;
        scanf("%d", &x);
        b[i] -= x;
    }

    for(int i = n;i ;i --) b[i] -= b[i - 1]; // 由原数组处理出差分数组

    int pos = 0, neg = 0;
    for(int i = 1;i <= n;i ++)
    {
        if(b[i] > 0) pos += b[i];
        else neg -= b[i];
    }

    printf("%d\n", max(pos, neg));

    return 0;
}
//这里填你的代码^^
//注意代码要放在两组三个点之间，才可以正确显示代码高亮哦~