Cod sursa(job #1134104)

Utilizator neaRMihai Balalau neaR Data 5 martie 2014 23:19:00
Problema Factorial Scor 30
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.28 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");

int main()
{int p,i,a,n;
f>>p;
n=0;
for(i=1;i<=p;i++) {a=i; while(a%5==0) {a=a/5; p--;n++;}}
if(n%5==0 && n>4) g<<"-1";
else g<<p*5;
//cout<<n<<" "<<p;
return 0;}