#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) ({unsigned _z=v;do*--wp=_z%10+48;while(_z/=10);})
#define wt1(v) ({char wbuf[64],*wp=wbuf+sizeof wbuf;wt(v);write(1,wp,wbuf+sizeof wbuf-wp);})
#define rep(v,e) for(typeof(e)v=0;v<e;++v)
#define chmax(v,a) (v=v>=a?v:a)

typedef unsigned long ulong;

ulong ab[2000];
char c[1000001];

void sort_aux(ulong*a,ulong*b,int n){
	int c[256];
	for(int i=0;i<256;++i){
		c[i]=0;
	}
	for(int i=0;i<n;++i){
		++c[a[i]&255];
	}
	int t=0;
	for(int i=0;i<256;++i){
		int u=c[i];
		c[i]=t;
		t+=u;
	}
	for(int i=0;i<n;++i){
		b[c[a[i]&255]++]=a[i]>>8|a[i]<<56;
	}
}

int main(){
	rd_init();
	int n=rd();
	rep(i,n){
		ab[i]=rd();
	}
	rep(i,n){
		ab[i]|=(ulong)(ab[i]+rd())<<32;
	}
	{
		ulong buf[2000];
		sort_aux(ab,buf,n);
		sort_aux(buf,ab,n);
		sort_aux(ab,buf,n);
		sort_aux(buf,ab,n);
	}
	unsigned z=1;
	c[1]=1;
	rep(i,n){
		ulong a=ab[i]>>32;
		if(c[a]){
			unsigned d=ab[i];
			c[d]=1;
			chmax(z,d);
		}
	}
	wt1(z);
	_exit(0);
}