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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int pow(int x)
{
int a=x,p=1;
while(a>0)
{
p=p*x%10;
a--;
}
return p;
}
int cifra(int x)
{
if(x==1)
return 1;
else
return cifra(x-1)+pow(x)%10;
}
int main()
{
int x,T;
f>>T;
for(int i=1; i<=T; i++)
{
f>>x;
g<<cifra(x)%10<<endl;
}
return 0;
}