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- #include <iostream>
- #include <set>
- #include <map>
- #include <vector>
- #include <algorithm>
- using namespace std;
- #define li long long
- bool isprime(long long n) {
- for (long long i = 2; i * i <= n; i++) {
- if (n % i == 0) {
- return 0;
- }
- }
- return 1;
- }
- int main() {
- li i;
- cin >> i;
- if (isprime(i)) {
- cout << "YES";
- }
- else {
- cout << "NO";
- }
- return 0;
- }
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