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#include <iostream>
#include <fstream>
using namespace std;
int pow(int &n)
{
int p=1;
for(int i=1; i<=n; i++)
{
p=(p*n)%10;
}
return p;
}
int main()
{
cout << "Hello world!" << endl;
ifstream f("cifra.in");
ofstream g("cifra.out");
int t, n;
f >> t;
for(int i=1; i<=t; i++)
{
f >> n;
int s=0;
for(int j=1; j<=n; j++) s=(s+pow(j))%10;
g << s << endl;
}
}