P79123: Nombres diabòlics

#include <iostream>
using namespace std;


long long base_4(long long n) {
    long long n4 = n%4;
    n = n/4;
    long long mult = 1;
    while (n != 0) {
        mult = mult*10;
        n4 = n4 + mult*(n%4);
        n = n/4;
    }
    return n4;
}

int suma_digits(long long n) {
    long long s = 0;
    while (n != 0) {
        s = s + n%10;
        n = n/10;
    }
    s = 2*s;
    return s;
}

bool es_diabolic(int n) {
    if (n%suma_digits(base_4(n)) == 0) return true;
    else return false;
}

int main() {
    int n, count = 0;
    while (cin >> n && n != -1) {
        if (es_diabolic(n)) ++count;
    }
    int digits = 0;
    for (int i = count; i != 0; i = i/10) {
        ++digits;
    }
    if (digits == 6) cout << count << endl;
    else if (digits == 5) cout << '0' << count << endl;
    else if (digits == 4) cout << "00" << count << endl;
    else if (digits == 3) cout << "000" << count << endl;
    else if (digits == 2) cout << "0000" << count << endl;
    else if (digits == 1) cout << "00000" << count << endl;
    else cout << "000000" << endl;
 }