#include <bits/stdc++.h>
 
using namespace std;
using ll = long long;
// #define int ll
using PII = pair<int, int>;
 
#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
 
template<typename T> T &chmin(T &a, const T &b) { return a = min(a, b); }
template<typename T> T &chmax(T &a, const T &b) { return a = max(a, b); }
template<typename T> bool IN(T a, T b, T x) { return a<=x&&x<b; }
template<typename T> T ceil(T a, T b) { return a/b + !!(a%b); }

template<typename T> vector<T> make_v(size_t a) { return vector<T>(a); }
template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts) { 
  return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}
template<typename T,typename V> typename enable_if<is_class<T>::value==0>::type
fill_v(T &t, const V &v) { t=v; }
template<typename T,typename V> typename enable_if<is_class<T>::value!=0>::type
fill_v(T &t, const V &v ) { for(auto &e:t) fill_v(e,v); }

template<class S,class T>
ostream &operator <<(ostream& out,const pair<S,T>& a){
  out<<'('<<a.first<<','<<a.second<<')'; return out;
}
template<typename T>
istream& operator >> (istream& is, vector<T>& vec){
  for(T& x: vec) {is >> x;} return is;
}
template<class T>
ostream &operator <<(ostream& out,const vector<T>& a){
  out<<'['; for(T i: a) {out<<i<<',';} out<<']'; return out;
}

int dx[] = {0, 1, 0, -1}, dy[] = {1, 0, -1, 0}; // DRUL
const int INF = 1<<30;
const ll LLINF = 1LL<<60;
const int MOD = 1000000007;

signed main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);

  string n, k;
  cin >> n >> k;

  ll m = 0, x = 1;
  reverse(ALL(n));
  for(char c: n) {
    (m += x * (c - '0') % 6) %= 6;
    (x *= 10) %= 6;
  }
  ll p = 0; x = 1;
  reverse(ALL(k));
  for(char c: k) {
    (p += x * (c - '0') % 6) %= 6;
    (x *= 10) %= 6;
  }

  // 0.285714
  if(m == 0) {
    cout << 4 << endl;
  } else if(m == 1) {
    cout << 2 << endl;
  } else if(m == 2) {
    if(p%2) cout << 8 << endl;
    else cout << 7 << endl; 
  } else if(m == 3) {
    cout << 5 << endl;
  } else if(m == 4) {
    cout << 7 << endl;
  } else if(m == 5) {
    if(p%2) cout << 1 << endl;
    else cout << 2 << endl;
  }

  return 0;
}