Untitled

#include <iostream>
#include <vector>

using namespace std;

void nextNumber(vector<int>& number, bool& finish) {
    static const int n = 13;
    finish = false;
    int rest = 1;
    for (int i = number.size() - 1; i >= 0; --i) {
        int val = number[i] + rest;
        rest = val / n;
        val = val % n;
        number[i] = val;
    }

    if (rest) {
        finish = true;
    }
}

long long getBeatifulNumbers() {
    vector<long> buf(6 * 13, 0);
    vector<int> number(6, 0);
    bool finish = false;
    while (!finish) {
        nextNumber(number, finish);
        int sum = 0;
        for (auto elem: number) {
            sum += elem;
        }
        buf[sum] += 1;
    }
    long long res = 0;
    for (auto elem : buf) {
        res += elem * elem;
    }
    res *= 13;
    return res;
}

int main()
{   
    cout << getBeatifulNumbers() << endl;
}