#include <bits/stdc++.h>
using namespace std;

#define int long long
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define mp make_pair
#define mt make_tuple

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;

const int inf = 1LL<<60;
const int mod = 1e9 + 7;
const double eps = 1e-9;

/*{
}*/

signed main()
{
  string s;
  cin >> s;
  int n = s.size();

  map<char, int> cnt;
  for(char c: s){
    cnt[c]++;
  }

  vi fac(n+1);
  fac[0] = 1;
  repi(i, 1, n+1) fac[i] = fac[i-1]*i;

  int ans = fac[n];
  for(auto c : cnt){
    ans /= fac[c.second]; 
  }

  cout << ans-1 << endl;

  return 0;
}