#54814: 算一種統計出來的結果 一行解
xutingyao0505@gmail.com
(TingYao Xu)
#include <iostream>
using namespace std;
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int a;
while (cin >> a) {
cout << (int)(a * 1.5) << "\n";
}
return 0;
}