#include <fstream>

using namespace std;

ifstream fin("fact.in");
ofstream fout("fact.out");

long long p,n,z;

int main()
{fin>>p;
fout<<-1;
/*if(p==0)fout<<1;
else
    {n=p*5;z=p;
    if(n>25){n-=5*(n/50);z-=n/50;}
    if(n>50){n-=5*(n/100);z-=n/100;}
    if(n>100){n-=(n/100)*5;z-=n/100;}
    if(n>1000){n-=(n/1000)*5;z-=n/1000;}
    if(z==p) fout<<n;
    if(z!=p) fout<<-1;
    }*/
    return 0;
}