#include <fstream>

using namespace std;

int main()
{
    fstream f("fact.in",ios::in),g("fact.out",ios::out);
    unsigned int p,n,i,j,N=1,s=0;
    f>>p;
    if(p==0)
        g<<1;
    else
        if(p<=5)
        g<<p*5;
    else
    for(i=p*4;i<p*5;i+=5)
    {
        s=0;
        for(j=5;j<=i;j=j*5)
            s+=i/j;
            if(s>p)
                g<<-1;
            else
            if(s==p)
                g<<i;
    }
    return 0;
}