#include <vector>
#include <fstream>
#include <algorithm>
#include <cmath>

using namespace std; // bad practice

int lastDigitOfPowab(int a, int b ) {

    // if a and b both are 0
    if (a == 0 && b == 0)
		return 1;

    // if exponent is 0
    if (b == 0)
        return 1;

    // if base is 0
    if (a == 0)
        return 0;

    // if exponent is divisible by 4 that means last
    // digit will be pow(a, 4) % 10.
    // if exponent is not divisible by 4 that means last
    // digit will be pow(a, b%4) % 10
    int exp = (b % 4 == 0) ? 4 : (b % 4);

    // Find last digit in 'a' and compute its exponent
    int res = static_cast<int>(pow(a % 10, exp));

    // Return last digit of result
    return res % 10;
}

int solve(int n) {
	int sum = 0;
	for (int i = 1; i <= n; i++)
		sum += lastDigitOfPowab(i, i);

	return sum % 10;
}

int main() {
	ifstream f("cifra.in");
    ofstream g("cifra.out");
	int n;
	f >> n;
	for (int i = 0; i < n; i++) {
		int num;
		f >> num;
		g << solve(num) << endl;
	}
}