#include<bits/stdc++.h>

#define INF 1000010000
#define nl '\n'
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define fi first
#define se second
#define pii pair<int,int>
#define pdd pair<double,double>
#define all(c) (c).begin(), (c).end()
#define SORT(c) sort(all(c))
#define rep(i,n) for( int i = 0; i < n; ++i )
#define repi(i,n) for( int i = 1 ; i <= n; ++i )
#define repn(i,n) for( int i = n - 1 ; i >= 0 ; --i )
#define repf(j,i,n) for( int j = i ; j < n ; ++j )
#define die(s) {std::cout << s << nl;}
#define dier(s) {std::cout << s; return 0;}
#define vi vector<int>
typedef long long ll;

using namespace std;


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.precision(0);
    vi d(101010 , 1);
    int a;
    rep(i , 10){
        cin >> a;
        int j = 1;
        while(a > 1){
            ++j;
            int kol = 0;
            while(a % j == 0){
                a /= j;
                ++kol;
            }
        d[j] += kol;
        }
    }
    int ans = 1;
    rep(i , d.size())
        if(d[i]) ans = (ans * d[i]) % 10;
    dier(ans);
    return 0;
}