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#include<fstream>
#include<string.h>
#include<stdlib.h>
using namespace std;
int n, aux;
char nr[101];
int main()
{
ifstream f;
f.open("cifra.in");
ofstream g;
g.open("cifra.out");
f>>n;
f.get();
for(int j=1;j<=n;j++)
{
f.get(nr,101);
f.get();
if(strlen(nr)>1)
aux=10*(nr[strlen(nr)-2]-'0')+nr[strlen(nr)-1]-'0';
else aux=nr[0]-'0';
int s=0,l;
for(int k=1;k<=aux;k++)
// s=s+fact(k,k);
{
l=1;
if(k%4==0)
l=k*k*k*k;
else
for(int i=1;i<=k%4;i++)
l=l*k;
s+=l%10;
}
g<<s%10<<endl;
}
return 0;
}