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- #include <iostream>
- using namespace std;
- int main() {
- int n;
- cin>>n;
- int bitAmount = 0;
- while (n) {
- bitAmount += n % 2;
- n /= 2;
- }
- if (bitAmount == 1)
- cout<<"YES";
- else
- cout<<"NO";
- return 0;
- }
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