#include<iostream>
#include<string>
#include<algorithm>
#define ALL s.begin(),s.end()
using namespace std;
int main(void){
	string s; cin >> s;
	int ans = 0;
	sort(ALL);
	do{ ans++; } while (next_permutation(ALL));
	cout << ans - 1 << endl;
	return 0;
}