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#include <fstream>
using namespace std;
ifstream cin("cifra.in");
ofstream cout("cifra.out");
int u[15][10];
const int NM=30000;
int v[NM+5];
int main()
{
int i,j;
for(i=0;i<=9;i++)
{
int p=i;
for(j=1;j<=3;j++)
{
u[i][j]=p%10;
p=p*i;
}
u[i][0]=p%10;
}
int s=0;
for(i=1;i<=NM;i++)
{
s=(s+u[i%10][i%4])%10;
v[i]=s;
}
int n;
cin>>n;
for(i=1;i<=n;i++)
{
cin>>j;
cout<<v[j]<<"\n";
}
cin.close();
cout.close();
return 0;
}