#include <bits/stdc++.h>

using namespace std;

int n = 10;
//int mang[10] = {-5, -4, -3, -2, -1, 0, 1, 2, 3, 4};
int mang[10] = {-6, -4, -2, -2, -6, 0, 4, 2, 4, 4};
bool check_ok = false;

int tong_le(int i) {
	if (i == n) return 0;
	if (mang[i] % 2 != 0) {
		check_ok = true;
		return mang[i] + tong_le(i + 1);
	}
	return tong_le(i + 1);
}

int main() {
	int ketQua = tong_le(0);
	if (check_ok) {
		cout << "Ket qua: " << ketQua;
	} else {
		cout << "Day khong co so le";
	}
	return 0;
}