// coached by rainboy
#include <algorithm>
#include <iostream>
using namespace std;
const int N = 100000;
const long long INF = 0x3f3f3f3f3f3f3f3fLL;
long long solve(int *bb, int n, int n_, bool eof) {
if (n == 1) {
int b = bb[0];
if (b == 1)
b = 3;
long long ans = 0;
for (int d = 1; d < 10; d++) {
if (b >> d & 1)
ans = ans * 10 + d;
if (ans && b & 1)
ans *= 10, b ^= 1;
}
if (!ans && !eof)
ans = 1;
return ans;
}
if (eof && !bb[0]) {
int m = (n + 9) / 10;
int *cc = new int[m];
for (int j = 0; j < m; j++)
cc[j] = 0;
for (int d = 1, j = 0, i = 1; i < n; i++) {
int b = bb[i];
if (b >> d & 1)
b ^= 1 << d;
cc[j] |= b;
if (d < 9)
d++;
else
d = 0, j++;
}
bool yes = !solve(cc, m, n, true);
delete[] cc;
if (yes)
return 0;
}
long long ans = INF;
for (int d_ = 0; d_ < 10; d_++) {
if (n_ == 2 && d_ == 9)
continue;
int m = 1 + (n - (10 - d_) + 9) / 10;
int *cc = new int[m];
for (int j = 0; j < m; j++)
cc[j] = 0;
for (int d = d_, j = 0, i = 0; i < n; i++) {
int b = bb[i];
if (b >> d & 1)
b ^= 1 << d;
cc[j] |= b;
if (d < 9)
d++;
else
d = 0, j++;
}
ans = min(ans, solve(cc, m, n, d_) * 10 + d_);
delete[] cc;
}
return ans;
}
int main() {
ios_base::sync_with_stdio(false), cin.tie(NULL);
int n; cin >> n;
int *bb = new int[n];
for (int i = 0; i < n; i++) {
int d; cin >> d;
bb[i] = 1 << d;
}
cout << solve(bb, n, 0, false) << '\n';
return 0;
}
