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#include <iostream>
#include <fstream>
#include <string.h>
#include <bits/stdc++.h>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int x[101];
int cifra(long long n)
{
int p,j;
p=1;
for(j=1;j<=n;j++)
p=(p*n)%10;
return (x[n-1]+p)%10;
}
int main()
{
int t,i;
char N[101];
long long int n;
for(i=1;i<=100;i++)x[i]=0;
x[1]=1;
for(i=2;i<=100;i++)
{
x[i]=cifra(i);
}
f>>t;
for(i=1;i<=t;i++)
{
f>>N;
n=atoll(N);
g<<cifra(n)<<'\n';
}
return 0;
}