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#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
long long int x[102];
int cifra(int n)
{
int p=1,i;
for(i=0; i<n; i++)
{
p=p*n;
}
return p%10;
}
int main()
{
int t,i,j,s,n;
char N[100000];
for(i=1;i<=100;i++)
x[i]=0;
x[1]=1; x[0]=0;
for(i=2;i<=100;i++)
{
x[i]=cifra(i);
}
f>>t;
for(i=0; i<t;i++)
{
f>>N;
n=atoi(N);
s=0;
for(j=1;j<=n;j++)
{
s+=cifra(j);
}
g<<s%10<<"\n";
}
return 0;
}