Cod sursa(job #1026334)

Utilizator morlockRadu Tatomir morlock Data 11 noiembrie 2013 15:20:19
Problema Factorial Scor 5
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.35 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;

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

long P;
int main()
{
    in >> P;
    long rez = P * 5;
    long temp = rez;
    long i = -1;

    while ( temp >= 5 )
    {
        i++;
        temp /= 5;
    }

    rez -= 5*( (i*(i+1))/2 );
    out << rez;

return 0;
}