#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (int i = (int)a; i < (int)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF 1000000000
#define PI 3.14159265359
#define EPS 1e-12

int main(void)
{
  bool a[11];
  memset(a, false, sizeof(a));
  REP(i, 9) {
    int b;
    cin >> b;
    a[b] = true;
  }

  FOR(i, 1, 11) {
    if(!a[i]) {
      cout << i << endl;
    }
  }

  return 0;
}