//FACTORIAL  
     
   #include<iostream.h>  
   #include<fstream.h>  
   long putere5(int k){  
        long p=1;  
        for(int i = 1;i<=k;i++,p*=5);  
        return p;  
   }  
   int main(){  
       long n,p,i,j,k;  
       ifstream in("fact.in");  
       ofstream out("fact.out");  
       in>>p;  
       //cin>>p;  
       n = 0;i = 0;  
       if(p==0)  
               out<<"1"<<endl;  
       else{  
       while(i<p){  
                   n+=5;  
                   i++;  
                   for(j = 2;j<=20;j++)  
                         if(n%putere5(j)==0) i++;  
                         else break;  
                     
       }  
       if(i>p)   
               cout<<"-1"<<endl;  
       else  
               out<<n<<endl;  
       }  
       //getch();  
       in.close();  
       out.close();  
       return 0;  
  }