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#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;
long long int s(long long int n)
{
long long int ret = 0;
for(int i = 1; i <= n; i++) {
long long int p = 1;
for(int j = 1; j <= i; j++) {
p *= i;
}
ret += p;
}
return ret;
}
int main()
{
ofstream output;
ifstream input;
output.open("cifra.out");
input.open("cifra.in");
int T;
long long int N;
input >> T;
for(int i = 0; i < T; i++) {
char* ch = new char[200];
input >> ch;
N = atoi(ch);
output << s(N) % 10 << endl;
}
return 0;
}