#include <bits/stdc++.h>

using namespace std;
// #include <atcoder/all>
// using namespace atcoder;
using ll =long long;
typedef pair<int,int> P;
#define SORT(a) sort((a).begin(),(a).end())
#define REV(a) reverse((a).begin(),(a).end())
#define For(i, a, b)    for(int i = (a) ; i < (b) ; ++i)
#define rep(i, n)       For(i, 0, n)
#define debug(x)  cerr << #x << " = " << (x) << endl;
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }

void coY() {cout <<"Yes"<<endl;}
void coN(){cout <<"No"<<endl;}

//Write From this Line


const int dy[] = {0,0,1,-1};
const int dx[] = {1,-1,0,0};
//const ll mod = 1e9+7;
//const ll mod = 998244353;
const double PI=3.14159265358979323846;
const int INF = 1001001001;
int main()
{
	int n;
	cin >> n;
	vector<int> a(n);
	rep(i, n)cin>>a[i];
	vector<int> b(n);
	rep(i, n)cin>>b[i];
	SORT(a);
	REV(a);
	SORT(b); 
	vector<int> v(n);
	rep(i,n) v[i] = i;
	ll M = 0;
	rep(i,n){
		M += max(a[i] - b[i], 0);
	}
	ll ans = 0;
	do {
		ll tmp = 0;
		rep(i,n){
			tmp += max(a[v[i]]-b[i],0);
		}
		if(tmp == M) ans++;
	} while (next_permutation(v.begin(), v.end()));
	cout << ans << endl;

}