题解 | 买橘子
买橘子
https://www.nowcoder.com/practice/73e0552b78474a9086781e47f4e01d73
//2026/2/3
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
int main() {
cin.tie(0) -> sync_with_stdio(0);
int n; cin >> n;
if(n%2 || n == 2 || n == 4 || n == 10) cout << -1 << endl;
else cout << (n+6)/8 << endl;
return 0;
}
