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#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;
ifstream f ("cifra.in");
ofstream g ("cifra.out");
int n;
int puterea (int n)
{
int p=1, i;
for (i=1; i<=n; i++)
p*=n%10;
return p%10;
}
int main()
{long s, i, x, y, j;
f>>n;
for (i=1; i<=n; i++)
{
f>>y;
s=0;
for (j=1; j<=y; j++)
{
x=pow (j,j);
s+=x%10;
}
g<<s%10<<"\n";
}
return 0;
}