1 #include <bits/stdc++.h>
 2 using namespace std;
 3 typedef long long ll;
 4 const ll mod=1e7;
 5 ll qpow(ll x,ll p)
 6 {
 7     ll ret=1;
 8     for(;p;p>>=1,x=x*x%mod)
 9     {
10         if(p&1)
11             ret=ret*x%mod;
12     }
13     return ret;
14 }
15 int main()
16 {
17     ll x;
18     cin>>x;
19     ll p=x;
20     ll ans=qpow(x,p);
21     cout<<ans%10<<endl;
22 }