#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
const ll MOD = 1000000007;
const ld PI = acos(-1);  
const ld EPS = 0.0000000001;
#define REP(i, n) for(ll i=0; i<(ll)(n); i++)
#define REPD(i, n) for(ll i=n-1; 0<=i; i--)
#define FOR(i, a, b) for(ll i=a; i<(ll)(b); i++)
#define FORD(i, a, b) for(ll i=a; (ll)(b)<=i; i--)
#define ALL(x) x.begin(), x.end()
#define MAX(x) *max_element(ALL(x))
#define MIN(x) *min_element(ALL(x))


int main(){
    int n;  cin >> n;
    map<int, int> a;
    a[0] = 3;
    ll res=1;
    REP(i, n){
        int x;  cin >> x;
        res *= a[x];
        res %= MOD;
        a[x] -= 1;
        a[x+1] += 1;
    }
    cout << res << endl;
}
#include <bits/stdc++.h>
using namespace std;

struct Fast {Fast(){std::cin.tie(0);ios::sync_with_stdio(false);}} fast;

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vector<int> > vii;
typedef queue<int> qi;
typedef stack<int> si;
typedef deque<int> dqi;

#define reps(i, a, b) for (int i = a; i < b; ++i)
#define rep(i, n) reps(i, 0, n)
#define REPS(i, a, b) reps(i, a, b)
#define REP(i, n) rep(i, n)
#define deps(i, a, b) for (int i = a; i >= b; --i)
#define dep(i, n) deps(i, n, 0)
#define DEPS(i, a, b) deps(i, a, b)
#define DEP(i, n) dep(i, n)

#define pf push_front
#define pb push_back
#define mp make_pair
#define fst first
#define FST fst
#define sec second
#define SEC sec
#define sz(obj) ((int)(obj).size())
#define all(v) (v).begin(), (v).end()
#define ALL(v) all(v)

const int INF = 999999999;
const int MOD = 1e9 + 7;
const int dx[] = {0, 1, 0, -1}, dy[] = {1, 0, -1, 0};

inline bool inside(int y, int x, int H, int W) {return y >= 0 && x >= 0 && y < H && x < W;}
inline int in() {int x; std::cin >> x; return x;}
template <typename T>
void print(std::vector<T>& v, char c = ' ') {
  REP(i, v.size()) {
    if (i != 0) std::cout << c;
    std::cout << v[i];
  }
  std::cout << endl;
}
template <typename T> void print(T x) { std::cout << x << '\n'; }

signed main()
{
  vi v(4);

  rep(i, 4) v[i] = in();
  sort(all(v));
  print(v[1] + v[2] + v[3] + max(in(), in()));

  return (0);
}