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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream f("cifra.in");
ofstream g("cifra.out");
int t, n, i, s, j, aux, p, u;
f >> t;
int v[t];
for(i=1;i<=t;i++)
{
f >> n;
v[i]=n;
}
for(i=1;i<=t;i++)
{
s=0;
j=1;
for(j=1;j<=v[i];j++)
{
p=1;
aux=j;
u=j;
while(j!=0)
{
p=p*aux;
j--;
}
s=s+p;
j=u;
}
g << s%10 << endl;
}
f.close();
g.close();
return 0;
}