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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int i,v[30000],j,s=0,T;
void citire(int v[30000],int &T)
{
f>>T;
for(i=0;i<T;i++)
{
f>>v[i];
}
}
int pow(int x)
{
int a=x,p=1;
while(a>0)
{
p*=x;
a--;
}
return p;
}
void cifra(int x)
{
for(i=0;i<T;i++)
{
s=0;
for(j=1;j<=v[i];j++)
{
s=s+pow(j,j)%10;
}
g<<s%10<<"\n";
}
}
int main()
{
citire(v,T)
for(i=0;i<T;i++)
cifra(t[i]);
return 0;
}