#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 (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF (1LL<<25)     //33554432
#define PI 3.14159265359
#define EPS 1e-12
//#define int ll

signed main(void)
{
  string n, m;
  cin >> n >> m;

  int a = n[n.size()-1] - '0', b;
  if(m.size() > 1 || (m.size() == 1 && m[0] > '3')) {
    b = 5;
  } else {
    b = m[0] - '0';
  }

  REP(i, b) {
    a = (a*a) % 10;
  }

  cout << a << endl;

  return 0;
}