#include <sstream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <iostream>
#include <utility>
#include <set>
#include <cctype>
#include <queue>
#include <stack>
#include <cstdio>
#include <cstdlib>
#include <cmath>

using namespace std;
typedef long long ll;

int main(void) {
    string s;
    cin >> s;
    int n = s.size();
    ll ans = 1;
    for (int i = 1; i <= n; i++) ans *= i;
    map<char, int> m;
    for (auto c : s) {
        m[c]++;
    }
    for (auto el : m) {
        ll tmp = 1;
        for (int i = 1; i <= el.second; i++) tmp *= i;
        ans /= tmp;
    }
    cout << ans-1 << endl;
    return 0;
}