include<bits/stdc++.h>

using namespace std; int main() { long long r=0,i,n,son=0,cavab=1; cin>>n; while(n>0){ i=n%10;

    if(i!=0){
cavab=cavab*i; }


    n=n/10;}
cout<<cavab;

}

include<bits/stdc++.h>

using namespace std; int main() { long long r=0,i,n,son=0,cavab=1; cin>>n; while(n>0){ i=n%10;

    if(i!=0){
cavab=cavab*i; }


    n=n/10;}
cout<<cavab;

}

include<bits/stdc++.h>

using namespace std; int main() { long long r=0,i,n,son=0,cavab=1; cin>>n; while(n>0){ i=n%10;

    if(i!=0){
cavab=cavab*i; }


    n=n/10;}
cout<<cavab;

}

include <bits/stdc++.h>

using namespace std; int main() { int n,hasil=1; cin>>n; while(n>0) { if(n%10!=0) { hasil=hasil*(n%10); } n/=10; } cout<<hasil; }//NAHID ZEYD VE RESSADDAN PROOOOOOOOOOOOO!!!!!!!!!!