#include <clocale>
#include <codecvt>
#include <fmt/format.h>
#include <fmt/xchar.h>
#include <iostream>
#include <string>

std::locale utf8loc(std::locale(), new std::codecvt_utf8<wchar_t>);
using namespace std;

long factorial(int x) noexcept {
	if (x <= 1) {
		return 1;
	}
	return x * factorial(x - 1);
}

int main(int argc, char **argv) {
	setlocale(LC_ALL, "en_US.UTF-8");
	wcout.imbue(utf8loc);
	wcin.imbue(utf8loc);

	for (int x = 1; x < 10; ++x) {
		wcout << fmt::format(L"{0:d}! = {1:d}", x, factorial(x)) << endl;
	}
	return 0;
}