#include <iostream>
using namespace std;
int main() {
int n;
cin >> n;
int group = (n - 1) / 3 + 1;
cout << group << endl;
return 0;
}
#include
using namespace std;
int main() {
int n;
cin >> n;
int group = (n - 1) / 3 + 1;
cout << group << endl;
return 0;
}
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