#include<bits/stdc++.h>
#define re register
using namespace std;
inline int read(){
	re int t=0;re char v=getchar();
	while(v<'0')v=getchar();
	while(v>='0')t=(t<<3)+(t<<1)+v-48,v=getchar();
	return t;
}
const int M=998244353;
inline void add(re int &x,re int y){(x+=y)>=M?x-=M:x;}
inline int Mod(re int x){return x>=M?x-M:x;}
inline int ksm(re int x,re int y){
	re int s=1;
	while(y){
		if(y&1)s=1ll*s*x%M;
		x=1ll*x*x%M,y>>=1;
	}
	return s;
}
int n,a[1002],b[1002],ans;
int main(){
	n=read(),ans=0;
	for(re int i=1;i<=n;++i)a[i]=read();sort(a+1,a+n+1);
	for(re int i=1;i<=n;++i)b[i]=read();sort(b+1,b+n+1);
	if(n==1)return printf("%d",abs(a[1]-b[1])),0;
	for(re int i=1;i<=n;++i){
		re int s=1e9;
		for(re int j=1;j<=n;++j)s=min(s,abs(a[i]-b[j]));
		ans=max(ans,s);
	}
	printf("%d",ans); 
}