#54850: 可以用布林值
s410313
(Cory)
#include <iostream>
using namespace std;
int main() {
int n;
cin >> n;
cout<< (n%3>0) + n/3;
return 0;
}
#include <iostream>
using namespace std;
int main() {
int n;
cin >> n;
cout<< (n%3>0) + n/3;
return 0;
}