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