#include
using namespace std;
int cnt = 0;
void count13(int a) {
if (a == 18)
cnt++;
if (a >= 18)
return;
count13(a + 1);
if (a != 0)
count13(a * 3);
}
int main() {
count13(3);
cout< return 0;
}
Ответ: 5. int cnt = 0;
void count13(int a)
{
if (a == 18)
cnt++;
if (a >= 18)
return;
count13(a + 1);
if (a != 0)
count13(a * 3);
}