#include <bits/stdc++.h>
using namespace std;

using ll = long long;
#define rep(i, n) for(int i = 0; i < n; i++)

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