#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=(a);i<=(b);i++)
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int,int>
#define pb push_back
#define F first
#define S second
#define mod 1000000007
#define maxn 1205

int sorted[maxn][maxn],m[maxn],n;
ll dp[maxn][maxn];
int main(){cin>>n;

    rep(i,1,n)scanf("%d",&m[i]);
    for(ll i=n;i>=1;i--)
    {
        sorted[i][i]=1;
        for(ll j=i+1;j<=n;j++)
        {
            sorted[i][j]=sorted[i+1][j];
            if(m[i]>m[i+1])
            sorted[i][j]=0;
        }
    }
    for(int i=n;i>0;i--){
        dp[1][i]=1;
        //dp[i][n+1]=1;
    }

    for(int j=2;j<=n;j++){
        for(int i=n;i>0;--i){
            int x=i+j-1;
            if(x>n)continue;
            if(!sorted[i][x])continue;
            if(x==n){
                dp[j][i]=1;
                continue;
            }
            ll val=1;
            for(int k=1;k<=j;k++){
                val=(val*(j-k+1))%mod;
                dp[j][i]+=(dp[k][x+1]*val)%mod;
                dp[j][i]%=mod;
            }
        }
    }    ll ans=0;
    for(int i=1;i<=n;i++)ans=(ans+dp[i][1])%mod;
    printf("%lld",ans);

}