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#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int T,N;
void cifra()
{int N; double x=0; f>>N;for(int j=1;j<=N;j++){x=x+pow(j,j);x=fmod(x,10);}
g<<x<<endl;
}
int main()
{f>>T;
for(int i=0;i<T;i++)cifra();
return 0;
}