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

int main() {
  string num = "285714";
  string n;
  cin >> n;
  int sum = 0, last = n[n.size() - 1];
  for (int i = 0; i < n.size(); i++) {
    sum += n[i] - '0';
  }
  int cnt = 0;
  while (sum % 3 != 0 || last % 2 != 0) {
    sum++;
    last++;
    cnt++;
  }
  if (cnt != 0) cnt = 6 - cnt;
  if (cnt == 0) {
    cout << num[5] << endl;
    return 0;
  }
  if (cnt == 1) {
    cout << num[0] << endl;
    return 0;
  }
  string k;
  cin >> k;
  if (cnt == 2) {
    if ((k[k.size() - 1] - '0') % 2 == 0) {
      cout << num[3] << endl;
    } else {
      cout << num[1] << endl;
    }
    return 0;
  }
  if (cnt == 3) {
    cout << num[2] << endl;
    return 0;
  }
  if (cnt == 4) {
    cout << num[3] << endl;
    return 0;
  }
  if (cnt == 5) {
    if ((k[k.size() - 1] - '0') % 2 == 0) {
      cout << num[0] << endl;
    } else {
      cout << num[4] << endl;
    }
    return 0;
  }
  return 0;
}