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#include <iostream>
#include<fstream>
#include<stdlib.h>
#include<cmath>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int cifra(int x)
{
int i,c,s=0;
for(i=1;i<=x;i++)
{
c=(pow(i,i))%10;
s+=c;
}
return s%10;
}
int main()
{
int T,x,i;
char N[1000];
f>>T;
for(i=1;i<=T;i++)
{
f>>N;
x=atoi(N);
g<<cifra(x)<<"\n";
}
f.close();
g.close();
return 0;
}