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#include <fstream>
using namespace std;
int main()
{
int n, i, nr, s, j, k;
ifstream fin("cifra.in");
fin >> n;
ofstream fout("cifra.out");
for(i = 1; i <= n + 1; i++)
{
fin >> nr;
s = 0;
for(i = 1; i <= nr; i++)
{
for(j = i, k = i; j > 1; j--)
k = (k * i) % 10;
s += k;
}
fout << s % 10 << "\n";
}
fin.close();
fout.close();
return 0;
}