#include<stdio.h>   
int main()   
{long int p,c=0,i,n;   
freopen("fact.in","r",stdin);   
freopen("fact.out","w",stdout);   
scanf("%ld",&p);   
i=0;   
if(p==0)   
    {   
        printf("1");   
        return 0;   
    }   
while(c<p)   
{   
    i=i+5;   
    n=i;   
    while(n%5==0)   
    {   
        c++;   
        n=n/5;   
    }   
}   
if(c==p)   
    printf("%ld",i);   
else  
    printf("-1");   
return 0;   
  
}