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5 months ago
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#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin>>n;
    if(n <= 1){
        cout<<"NO";
        return 0;
    }
    for(int i = 2; i < n; i++){
        if(n % i == 0){
            cout<<"NO";
            return 0;
        }
    }
    cout<<"YES";
    return 0;
}


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