Cod sursa(job #905549)

Utilizator raducalin111Radu Calin-Stefan raducalin111 Data 5 martie 2013 21:54:44
Problema Factorial Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.26 kb
Raporteaza aceasta sursa 
#include<iostream>
#include<fstream>
using namespace std;
int main(){
	ifstream f("fact.in");
	ofstream g("fact.out");
	int n,k=5,s=0;
	f>>n;
	while(k<=n)
	{s=s+1;
	k=k*5;}
	if(k/5==n)
		g<<-1;
	else
	g<<5*(n-s);
	f.close();
	g.close();
	return 0;
}