#include<iostream>
#include<cstdlib>
using namespace std;
int main(){
long int a,b;
long long int i=0,w=0;
cin>>a;
if(a==0)
cout << 0;
else{
while(a>0){
b=a%10;
if(b!=0){i=1;
while(b>0){
i*=b;
b--;}
w+=i;}
a=(a-b)/10;}
cout<<w;}return 0;}
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