Cod sursa(job #433980)

Utilizator crushackPopescu Silviu crushack Data 4 aprilie 2010 20:53:21
Problema Factorial Scor 5
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.27 kb
Raporteaza aceasta sursa 
#include <stdio.h>


int main()
{
	int p,i;
	long long n;
	freopen("fact.in","r",stdin);
	freopen("fact.out","w",stdout);
	scanf("%d",&p);
	n=p*5;
	for (i=5;i<p;i*=5)
		n-=5;
	if (i==p)
		printf("-1\n");
	else 
		printf("%d\n",n);
	fclose(stdout);
	return 0;
}