#include
using namespace std;
int main() {
    int a,b;
    cin >> a >> b;
    if (a % 2 == 0 || b % 2 == 0) cout << "No";
    else cout << "Yes";
    return 0;
}

Với mọi k có dạng ab, k \vdots 2 khi a \vdots 2 hoặc b \vdots 2.

Vậy k $$\not\vdots$$ 2 khi a $$\not\vdots$$ 2 và b $$\not\vdots$$ 2.

Ta luôn có lựa chọn C sao cho C $$\not\vdots$$ 2, vậy ABC $$\not\vdots$$ 2 khi AB $$\not\vdots$$ 2.

$$\\$$

$$\color{#1fdb91}{\texttt{C}}\color{#0aaec9}{\texttt{+}}\color{#e9418e}{\texttt{+}}$$

#include

using namespace std;

int main() {
    
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    
    long long a, b; cin >> a >> b;
    cout << (a*b % 2 & 1? "Yes" : "No");
    
}

$$\\$$
\begin{array}{c|c|c}\color{#ffd710}{\texttt{\{}} \color{#8655d6}{\texttt{\{}}\ \ \color{#8cdcda}{\text{Daoanhviet96}}\ \ \color{#8655d6}{\texttt{\}}} \color{#ffd710}{\texttt{\}}}\end{array}