#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
    string s;cin>>s;
    sort(s.begin(),s.end());
    vector<string> A;
    do{
        A.push_back(s);
    }while(next_permutation(s.begin(),s.end()));
    cout << A.size()-1 << endl;
}