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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int main()
{
int s,p;
int n,i,j,nn,h;
fin>>n;
int v[n];
for(i=1;i<=n;i++) fin>>v[i];
for(h=1;h<=n;h++)
{
nn=v[h];
s=0;
for(i=1;i<=nn;i++)
{
p=1;
for(j=1;j<=i;j++)
p=(p*i)%10;
s=(s+p)%10;
}
fout<<s<<endl;
}
fin.close();
fout.close();
return 0;
}