#include <iostream>
using namespace std;

int main() {
    int n;
    cout<<" enter a number : "<<endl;
    cin>>n;
    int sum;
    sum = 1;
    while(n>0){
        int ld;
        ld = n%10;
        sum = sum *  ld;
        
     n = n/10;
        
    }
   
    

    cout<<sum;
    
}