include <iostream>

using namespace std;

int main(){
int n;
cin >> n;
if (n <= 1000){
cout << "YES";
}
else{
cout << "NO";
}
return 0;
}

include <iostream>

using namespace std;

int main()
{
int n;
cin >> n;

if (n % 2 == 0)
    cout << -n / 2;
else 
    cout << n / 2 + 1;

return 0;

}

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