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#include <fstream>
#include <cmath>
using namespace std;
int calculate(int n);
int main()
{
ifstream f("cifra.in");
ofstream g("cifra.out");
int n;
f >> n;
for(int i = 0;i < n ;i++) {
int temp;
f >> temp;
g << calculate(temp) << "\n";
}
return 0;
}
int calculate(int n) {
int sum = 0;
for(int i = 1;i < n + 1;i++) {
int temp = pow(i, i);
sum += temp;
}
return sum % 10;
}