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

#define rd() ({long _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) {ulong _z=v;do*--wp=_z%10+48;while(_z/=10);}
#define rep(v,e) for(long v=0;v<e;++v)

typedef unsigned long ulong;

int a[100001];

int main(){
	long z=0;
	{
		char*mmap();
		char*rp=mmap(0l,1l<<25,1,2,0,0ll);
		long n=rd();
		rep(i,n){
			a[rd()]=i;
		}
		long y=0;
		rep(i,n){
			long x=a[rd()];
			z+=y>x;
			y=x;
		}
	}
	{
		char wbuf[64],*wp=wbuf+sizeof wbuf;
		wt(z?32-__builtin_clz(z):0);
		write(1,wp,wbuf+sizeof wbuf-wp);
	}
	_exit(0);
}