#include<bits/stdc++.h>
#define mod 998244353

using namespace std;

int main(){
  int n;
  cin >> n;
  vector<int> a(n);
  int sig=0;
  for(int i=0;i<n;i++){
    cin >> a[i];
    sig+=a[i];
  }
  if(sig%2==1){cout << "0\n";return 0;}
  vector<vector<int>> dp(n+1,vector<int>(5005));
  dp[0][0]=1;
  for(int i=0;i<n;i++){
    for(int j=i;j>=0;j--){
      for(int k=0;k<=5000-a[i];k++){
        dp[j+1][k+a[i]]+=dp[j][k];
        dp[j+1][k+a[i]]%=mod;
      }
    }
  }
  long long res=0;
  for(int i=0;i<=n;i++){
    long long cv=dp[i][sig/2];
    for(long long j=1;j<=i;j++){cv*=j;cv%=mod;}
    for(long long j=1;j<=n-i;j++){cv*=j;cv%=mod;}
    res+=cv;res%=mod;
  }
  cout << res << '\n';
  return 0;
}

// Problem: E. String Reversal
// Contest: Codeforces - Educational Codeforces Round 96 (Rated for Div. 2)
// URL: https://codeforces.com/contest/1430/problem/E
// Memory Limit: 256 MB
// Time Limit: 2000 ms
// 
// Powered by CP Editor (https://cpeditor.org)

//#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4.1,sse4.2,avx,avx2,popcnt,tune=native")
//#pragma GCC optimize(2)
#include<cstdio>
#include<iostream>
#include<string>
#include<cstring>
#include<map>
#include<cmath>
#include<cctype>
#include<vector>
#include<set>
#include<queue>
#include<algorithm>
#include<sstream>
#include<ctime>
#include<cstdlib>
#define X first
#define Y second
#define L (u<<1)
#define R (u<<1|1)
#define pb push_back
#define mk make_pair
#define Mid (tr[u].l+tr[u].r>>1)
#define Len(u) (tr[u].r-tr[u].l+1)
#define random(a,b) ((a)+rand()%((b)-(a)+1))
#define db puts("---")
using namespace std;

//void rd_cre() { freopen("d://dp//data.txt","w",stdout); srand(time(NULL)); }
//void rd_ac() { freopen("d://dp//data.txt","r",stdin); freopen("d://dp//AC.txt","w",stdout); }
//void rd_wa() { freopen("d://dp//data.txt","r",stdin); freopen("d://dp//WA.txt","w",stdout); }

typedef long long LL;
typedef unsigned long long ULL;
typedef pair<int,int> PII;

const int N=1000010,mod=1e9+7,INF=0x3f3f3f3f;
const double eps=1e-6;

int n;
int a[N],b[N];
map<int,vector<int>>v;
struct Node {
	int l,r;
	LL cnt,lazy;
}tr[N<<2];

void pushdown(int u) {
	if(!tr[u].lazy) return;
	LL lazy=tr[u].lazy; tr[u].lazy=0;
	tr[L].lazy+=lazy; tr[R].lazy+=lazy;
	tr[L].cnt+=lazy; tr[R].cnt+=lazy;
}

void build(int u,int l,int r) {
	tr[u]={l,r,1,0};
	if(l==r) {
		tr[u].cnt=l;
		return;
	}
	build(L,l,Mid); build(R,Mid+1,r);
} 

void change(int u,int l,int r,int c) {
	if(tr[u].l>=l&&tr[u].r<=r) {
		tr[u].cnt+=c;
		tr[u].lazy+=c;
		return;
	}
	pushdown(u);
	if(l<=Mid) change(L,l,r,c);
	if(r>Mid) change(R,l,r,c);
}

int query(int u,int l,int r) {
	if(tr[u].l>=l&&tr[u].r<=r) return tr[u].cnt;
	int ans=0;
	pushdown(u);
	if(l<=Mid) ans+=query(L,l,r);
	if(r>Mid) ans+=query(R,l,r);
	return ans;
}

LL solve() {
	LL ans=0;
	build(1,1,n);
	for(int i=1;i<=n;i++) {
		int pos=v[b[i]].back(); v[b[i]].pop_back();
		LL now=query(1,pos,pos);
		ans+=now-i;
		change(1,1,pos,1);
	}
	return ans;
}

bool check() {
	map<int,int>mp1,mp2;
	for(int i=1;i<=n;i++) mp1[a[i]]++;
	for(int i=1;i<=n;i++) mp2[b[i]]++;
	for(int i=1;i<=n;i++) if(mp1[a[i]]!=mp2[a[i]]) return false;
	return true;
}

int main()
{
//	ios::sync_with_stdio(false);
//	cin.tie(0);
	
	int _=1;
	while(_--) {
		cin>>n;
		for(int i=1;i<=n;i++) scanf("%d",&a[i]),a[i]+=i;
		for(int i=1;i<=n;i++) scanf("%d",&b[i]),b[i]+=i;
		for(int i=n;i>=1;i--) v[a[i]].pb(i);
		if(!check()) {
			puts("-1");
			return 0;
		}
		printf("%lld\n",solve());
	}



	return 0;
}
/*

*/








