#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main() {
	string s;
	cin >> s;
	sort(s.begin(), s.end());
	int count = 0;
	do {
		++count;
	} while (next_permutation(s.begin(), s.end()));
	cout << (count - 1) << endl;
	return 0;
}