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#include <iostream> using namespace std; int main(){ long long n;cin>>n;int v=0; for (int i = 2;i<n;++i) { if (n % i == 0) v++; if (v) { cout<<"NO"; return 0; } } cout<<"YES"; return 0; }
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#include <iostream> using namespace std; int main(){ long long n;cin>>n;int v=0; for (int i = 2;i<n;++i) { if (n % i == 0) v++; if (v) { cout<<"NO"; return 0; } } cout<<"YES"; return 0; }