#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>

using namespace std;

int main() {
	string s;

	cin >> s;
	sort(s.begin(), s.end());

	int ans = -1;
	do {
		ans++;
	} while(next_permutation(s.begin(), s.end()));

	cout << ans << endl;
	return 0;
}