#include <iostream>
using namespace std;
int main() {
int num, p, ep;
cout << "Dwse arithmo: ";
cin >> num;
p = num - 1;
ep = num + 1;
cout << "Prohgoumenos arithmos: " << p << endl;
cout << "Epomenos arithmos: " << ep << endl;
return 0;
}
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