#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
const int N=101+10,M=1e3+10;
const int mod=1e9+7;
int suf[2*N][2*M],pre[2*N][2*M],a[N],b[N],mpa[N],mpb[N];
vector<int> compress;
int main()
{
int n;
cin>>n;
for(int i=0;i<n;i++)cin>>a[i];
for(int i=0;i<n;i++)cin>>b[i];
for(int i=1;i<M;i++)compress.push_back(i);
sort(begin(compress),end(compress));
compress.resize(unique(begin(compress),end(compress))-begin(compress));
for(int i=0;i<n;i++)mpa[i]=lower_bound(begin(compress),end(compress),a[i])-begin(compress);
for(int i=0;i<n;i++)mpb[i]=lower_bound(begin(compress),end(compress),b[i])-begin(compress);
int sz=compress.size();
pre[0][0]=1;
for(int i=0;i<n;i++)
{
for(int j=0;j<sz;j++)
{
pre[i+1][max(j,mpa[i])]+=pre[i][j];
if(pre[i+1][max(j,mpa[i])]>=mod)pre[i+1][max(j,mpa[i])]-=mod;
pre[i+1][max(j,mpb[i])]+=pre[i][j];
if(pre[i+1][max(j,mpb[i])]>=mod)pre[i+1][max(j,mpb[i])]-=mod;
}
}
suf[n-1][0]=1;
for(int i=n-1;i>0;i--)
{
for(int j=0;j<sz;j++)
{
suf[i-1][max(j,mpa[i])]+=suf[i][j];
if(suf[i-1][max(j,mpa[i])]>=mod)suf[i-1][max(j,mpa[i])]-=mod;
suf[i-1][max(j,mpb[i])]+=suf[i][j];
if(suf[i-1][max(j,mpb[i])]>=mod)suf[i-1][max(j,mpb[i])]-=mod;
}
}
int ans=0;
for(int i=0;i<n;i++)
{
// use pre[i]
for(int j=sz-2;j>=0;j--)
{
pre[i][j]+=pre[i][j+1];
suf[i][j]+=suf[i][j+1];
}
for(int j=mpa[i]+1;j<sz;j++)
{
// if for each (i,h) number of ways such that height of i is atleast h
ans+=((pre[i][j]*suf[i][j])%mod);
if(ans>=mod)ans-=mod;
}
for(int j=mpb[i]+1;j<sz;j++)
{
ans+=((pre[i][j]*suf[i][j])%mod);
if(ans>=mod)ans-=mod;
}
// way to make height >=j on prefix i
}
cout<<ans<<endl;
}
