#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 2000000000



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