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#include <fstream>
using namespace std;
ifstream fin("fact.in");
ofstream fout("fact.out");
int main()
{
int n,r;
fin>>n;
r=n*5
r=r-n/5;
r=r-n/5/5;
r=r-n/5/5/5;
r=r-n/5/5/5/5;
r=r-n/5/5/5/5/5;
r=r-n/5/5/5/5/5/5;
r=r-n/5/5/5/5/5/5/5;
r=r-n/5/5/5/5/5/5/5/5;
r=r-n/5/5/5/5/5/5/5/5/5;
r=r-n/5/5/5/5/5/5/5/5/5/5;
r=r-n/5/5/5/5/5/5/5/5/5/5/5;
r=r-n/5/5/5/5/5/5/5/5/5/5/5/5;
r=r-n/5/5/5/5/5/5/5/5/5/5/5/5/5;
fout<<r;
}