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#include <fstream>
#include <math.h>
using namespace std;
ifstream fin("fact.in");
ofstream fout("fact.out");
int main()
{
long long p;
int n=0, j=2,k=2;
fin>>p;
for (int i=1; i<=p; i++){
n+=5;
if(n%int(pow(5,j))==0){
n-=5;
j++;}
if(n%int(pow(10,k))==0){
n-=5;
k++;}
}
fout<<n;
return 0;
}