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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int u_c_put(long a)
{
//a la a
int put=1;
for(int i=1;i<=a;i++)
put=put*a%10;
return put;
}
long t,n,s=0;
int main()
{
/*int t,n,i,cif,put,k,s=0,j;
fin>>t;
for(i=1;i<=t;i++)
{
fin>>n;
for(j=1;j<=n;j++)
{
put=1;
cif=j%10;
if(cif==0||cif==1||cif==5||cif==6||cif==9)
put=cif;
else
if(cif==4)
put=6;
else
{
put=1;
for(k=1;k<=j%4;k++)
{
put=put*cif%10;
}
if(j%4==0)
if(cif==2||cif==8)
put=6;
else
put=1;
}
}
s=(s+put)%10;
fout<<s<<'\n';
}*/
fin>>t;
for(int i=1;i<=t;i++)
{
fin>>n;
s=0;
for(int j=1;j<=n;j++)
s=(s+u_c_put(j))%10;
fout<<s<<'\n';
}
return 0;
}