#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
using ll =  long long ;
using P = pair<int,int> ;
const ll INF = 1e18;
const int MOD = 1000000007;

int main(){
    string sn,sk;
    cin >> sn >> sk;
    int p = (sn[sn.size()-1] - '0')%2;
    int q = 0;
    rep(i,sn.size()){
        q = (q + sn[i] - '0')%3;
    }
    int n;
    if(p==0){
        if(q==0) n = 0;
        else if(q==1) n = 4;
        else if(q==2) n = 2;
    }else{
        if(q==0) n = 3;
        else if(q==1) n = 1;
        else if(q==2) n = 5;
    }
    int k = (sk[sk.size()-1] - '0')%2;
    int ans;
    if(n==0){
        ans = 4;
    }else if(n==1){
        ans = 2;
    }else if(n==2){
        if(k==1) ans = 8;
        else ans = 7;
    }else if(n==3){
        ans = 5;
    }else if(n==4){
        ans = 7;
    }else{
        if(k==1) ans = 1;
        else ans = 2;
    }
    cout << ans << endl;
    return 0;
}