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#include <iostream>
using namespace std;
int main() {
int N;
cin>>N;
if(N>1){
if(N%2==0)
cout<<N/2;
if(N%2 !=0)
cout<<N;
}
else{
cout<<"0";
}
}
#include <iostream>
using namespace std;
int main() {
int N;
cin>>N;
if(N>1){
if(N%2==0)
cout<<N/2;
if(N%2 !=0)
cout<<N;
}
else{
cout<<"0";
}
}