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

void solve() {
    std::string s;
    std::cin >> s;
    std::sort(s.begin(), s.end());

    int ans = 0;
    do {
        ++ans;
    } while (std::next_permutation(s.begin(), s.end()));

    std::cout << ans - 1 << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}