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Cod sursa(job #793205)
#include <fstream>
using namespace std;
ifstream fin ("fact.in");
ofstream fout ("fact.out");
int n;
int zero;
int nr = 0, aux;
int main ()
{
fin >> n;
if (n == 0)
fout << "1";
else
{
while (zero < n)
{
nr = nr + 5;
aux = nr;
while (aux % 5 == 0)
{
zero++;
aux = aux / 5;
}
}
if (zero == n)
fout << nr;
else
fout << "-1";
}
fin.close ();
fout.close ();
return 0;
}