#include<stdio.h>
#include<math.h>
int main()
{
long long int P,fact=1,N,nr=0;
int i=0,j,k,m,n,aux;
FILE*in=fopen("factorial.in","r");
FILE*out=fopen("factorial.out","w");
fscanf(in,"%lld",&P);


while(nr<P)
{
i+=5;
aux=i;
while(aux%5==0)
 {
  aux/=5; nr++;}
}
if(nr==P) fprintf(out,"%d",i);
else fprintf(out,"-1");

fcloseall();
return 0;
}