#include<bits/stdc++.h>
using lint=long long;
using real=long double;
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    std::vector<std::vector<lint>>zero(4,std::vector<lint>(4));
    lint mod=1'000'000'007;
    auto encode=[&](auto&&s){return (s.at(0)-'0')*2+(s.at(1)-'0');};
    auto mul=[&](auto&&a,auto&&b){
        auto c=zero;
        for(lint i=0;i<4;i++){
        for(lint j=0;j<4;j++){
        for(lint k=0;k<4;k++){
            c.at(i).at(j)+=a.at(i).at(k)*b.at(k).at(j);
            c.at(i).at(j)%=mod;
        }}}
        return c;
    };
    std::vector<std::vector<std::string>>members{{"000","100","111"},{"001","010","011","101","110"}};
    std::vector<std::vector<std::vector<lint>>>a(2,zero);
    for(lint i=0;i<2;i++){
        for(std::string s:members.at(i)){
            lint j=encode(s.substr(0,2));
            lint k=encode(s.substr(1,2));
            a.at(i).at(j).at(k)++;
        }
    }
    auto dp=zero;
    for(lint i=0;i<4;i++)dp.at(i).at(i)=1;
    lint n;std::cin>>n;
    while(n--){
        lint x;std::cin>>x;
        dp=mul(dp,a.at(x));
    }
    lint ans=0;
    for(lint i=0;i<4;i++)ans+=dp.at(i).at(i);
    ans%=mod;
    std::cout<<ans<<'\n';
}