10070 - Leap Year or Not Leap Year and …, uva

#include<iostream>
#include<cstdio>
#include<cstdlib>
#define db(a) cout << #a << " = " << a << endl
using namespace std;
string linea;
int n = 0;
bool esbisiesto() {
 bool fin = false;
 int num = 0, t = 1;
 for (int i = 0; i < 4 && !fin; i++) {
  if (i >= n) {
   fin = true;
   continue;
  }
  num = t * (linea[n - i - 1] - 48) + num;
  t *= 10;
 }
 //db(num);
 return (num % 4 == 0 && num % 100 != 0) or (num % 400 == 0);
}
int main() {
 bool por3, por5, por11, bisiesto, first = true;
 while (cin >> linea) {
  if (!first) puts("");
  else first = false;
  n = linea.size();
  bisiesto = esbisiesto();
  int suma11 = 0;
  int suma3 = 0;
  for (int i = 0; i < n; i++) {
   suma3 += linea[i] - 48;
   if (i % 2) suma11 += linea[i] - 48;
   else suma11 -= linea[i] - 48;
  }
  por3 = (suma3 % 3 == 0);
  por5 = (linea[n - 1] - 48) % 5 == 0;
  por11 = suma11 % 11 == 0;
  if (bisiesto) puts("This is leap year.");
  if (por3 && por5) puts("This is huluculu festival year.");
  if (por5 && por11 && bisiesto) puts("This is bulukulu festival year.");
  if (!bisiesto && !(por3 && por5) && !(por5 && por11 && bisiesto))
   puts("This is an ordinary year.");
 }
 return 0;
}