#include <bits/stdc++.h>
using namespace std;

#define int long long
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define mp make_pair
#define mt make_tuple

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;

const int inf = 1LL<<60;
const int mod = 1e9 + 7;
const double eps = 1e-9;

/*{
}*/

signed main()
{
  int t;
  cin >> t;

  int ans = inf;
  while(t--){
    string s;
    cin >> s;
    int n = s.size();

    rep(i, n){
      if('0' <= s[i] and s[i] <= '9') s[i] -= '0';
      else s[i] -= 'A'-10;
    }

    int b = *max_element(all(s))+1;
    reverse(all(s));
    int tmp = 0, base = 1;
    rep(i, n){
      tmp += base*s[i];
      base *= b;
    }

    ans = min(ans, tmp);
  }

  cout << ans << endl;
  
  return 0;
}