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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int t,c,i,j,x,p,s,a[10000];
int main()
{
f>>t;
for (j=1; j<=t; j++)
{
f>>a[j];
}
for (j=1; j<=t; j++)
{
s=0;
for (i=1; i<=a[j]; i++)
{
c=i%4;
x=i%10;
if (c==0)
{
p=(x*x*x*x)%10;
s=(s+p)%10;
}
if (c==1)
{
s=(s+x)%10;
}
if (c==2)
{
p=(x*x)%10;
s=(s+p)%10;
}
if (c==3)
{
p=(x*x*x)%10;
s=(s+p)%10;
}
}
g<<s<<'\n';
}
return 0;
}