#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N;
  cin>>N;
  vector<int> S(N);
  for(int i=0;i<N;i++) cin>>S[i];
  sort(S.rbegin(),S.rend());
  if(S[0] >= 4){
      cout<<1000000007<<endl;
      return 0;
  }
  vector<int> A={0,1,4,729};
  int ans = 1;
  for(int i=0;i<N;i++){
      ans *= A[S[i]];
      if(ans > 1e9+7){
          cout<<1000000007<<endl;
          return 0;
      }
  }
  cout<<1000000007%ans<<endl;
}