http://codeforces.com/problemset/problem/670/A Holidays

容易想到，先排两天假期在前面可以产生最大的假期，注意最小的假期，也需要注意最后不足一周的情况。

#include <iostream>
#include <string>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#define MAX 100005
#define mod 998244353ll
#define INF 0x3f3f3f3f
#define ll long long
using namespace std;
int main() {
    freopen("a.txt", "r", stdin);
    freopen("b.txt", "w", stdout);
    int n;
    cin >> n;
    if (n <= 2) {
        cout << 0 << " " << n << endl;
        return 0;
    }
    int s1, s2;
    int t = n / 7;
    s1 = t * 2;
    if (n % 7 >= 6) s1++;
    s2 = 2;
    n -= 2;
    t = n / 7;
    s2 += t * 2;
    if (n % 7 >= 6) s2++;
    cout << s1 << " " << s2 << endl;
    return 0;
}