#include <bits/stdc++.h>
using namespace std;
#define int long long
int ans = 1000000000000000000;
int pw[20];
void rek(vector<int> sections, int curr = 0, int level = 0, bool flag = false) {
if (curr >= ans) return;
int n = sections.size();
if (n == 1) {
int mask = sections[0];
if (!mask) {
if (!curr || flag) curr += pw[level];
} else if (mask == 1) curr += pw[level + 1];
else {
if (mask & 1) {
int mn = 10;
for (int i = 9; i; --i) {
if (mask & (1 << i)) mn = i;
}
for (int i = 9; i; --i) {
if ((mask & (1 << i)) && i != mn) curr += i * pw[level++];
}
curr += mn * pw[++level];
} else {
for (int i = 9; i; --i) {
if (mask & (1 << i)) curr += i * pw[level++];
}
}
}
ans = min(ans, curr);
return;
}
for (int i = 0; i < 10; ++i) {
vector<int> merged;
int ins = 0;
bool zero = false;
int piv = i;
for (int j = 0; j < n; ++j) {
zero |= (piv == 0 && (sections[j] & 1));
ins |= (sections[j] & (~(1 << piv)));
piv++;
if (piv == 10) {
merged.push_back(ins);
ins = piv = 0;
}
}
if (piv) merged.push_back(ins);
rek(merged, curr + pw[level] * i, level + 1, zero);
}
}
signed main() {
int n;
cin >> n;
vector<int> sections(n);
for (int i = 0; i < n; ++i) {
int x;
cin >> x;
sections[i] = (1 << x);
}
pw[0] = 1;
for (int i = 1; i < 18; ++i) pw[i] = 10 * pw[i - 1];
rek(sections);
cout << ans << endl;
}
