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

signed main(){
  int N; cin >> N;
  vector< string > A( N );
  for( int i = 0; i < N; ++i )
    cin >> A[ i ];
  long long ans = 0x3f3f3f3f3f3f3f3fLL;
  for( int i = 0; i < N; ++i )
    ans = min( ans, stoll( A[ i ], nullptr, 0 ) );
  cout << ans << endl;
  return 0;
}