#include<bits/stdc++.h>
#define ll long long
using namespace std;
inline ll read(){
	register ll s=0,f=0;
	register char ch=getchar();
	while(!isdigit(ch)) f|=(ch=='-'),ch=getchar();
	while(isdigit(ch)) s=(s<<1)+(s<<3)+(ch^48),ch=getchar();
	return f?-s:s;
}
int n;
ll a,b,c,d;
int main() {
	n=read();
	for(int i=1;i<=n;i++)a+=read(),b+=read();
	for(int i=1;i<=n;i++)c+=read(),d+=read();
	printf("%lld",abs(a-c)+abs(b-d));
	return 0;
}

退役OIer回来随机到的第一题，不知道哪里出问题了，求解答