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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int pow(int nr, int exp)
{
long long int p=1, baza=nr;
while(exp)
{
if((exp&1)!=0)
p=p*baza%100;
exp>>=1;
baza=baza*baza%100;
}
return p;
}
int main()
{
int t,n,i,j,s;
fin >> t;
for(i=1;i<=t;i++)
{
s=0;
fin >> n;
for(j=1;j<=n;j++)
s=s+pow(j,j);
fout << s%10 << "\n";
}
return 0;
}