Cod sursa(job #591441)

Utilizator PetruDPetru Dimitriu PetruD Data 24 mai 2011 10:39:47
Problema Factorial Scor 25
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.33 kb
Raporteaza aceasta sursa 
#include <fstream.h>

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

long long n,e,i,aux;

int main()
{
	in >> n;
	if (n==0)
		out << 1;
	else if (n==1)
		out << 5;
	else
	{
	e = 0;
	for (i=5;e<n;i+=5)
	{
		aux = i;
		while (aux%5==0)
			{ e++; aux/=5; }
	}
	if (e==n)
		out << i-5;
	else
		out << -1;
	}
}