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#include <iostream>
#include <fstream>
using namespace std;
int pow(int &px)
{
int putere=1;
for(int i=1; i<=px; i++) putere=putere%10*px%10;
return putere;
}
int main()
{
ifstream f("cifra.in");
ofstream g("cifra.out");
int t;
f >> t;
int *pv;
pv=new int [t];
for(int i=0; i<t; i++)
{
f >> *(pv+i);
int s=0;
for(int j=1; j<=*(pv+i); j++) s=(s+pow(j))%10;
g << s << endl;
}
}