USACO Combination Lock

Notice that $n$ may be smaller than 5.

Code

/*
ID: wcr19961
PROG: combo
LANG: C++11
*/
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cstdlib>
#include <string>
#include <set>
using namespace std;

typedef long long LL;
const int maxn = 5;
int a[maxn], b[maxn];
set<int> s[maxn];

int main() {
  freopen("combo.in", "r", stdin);
  freopen("combo.out", "w", stdout);
  int n, ans = 1;
  scanf("%d", &n);
  scanf("%d%d%d", &a[0], &a[1], &a[2]);
  scanf("%d%d%d", &b[0], &b[1], &b[2]);
  for (int i = 0; i < 3; ++i) {
    if (a[i] < b[i]) {
      swap(a[i], b[i]);
    }
    ans *= max(0, 5 - min(a[i] - b[i], b[i] - a[i] + n));
  }
  printf("%d\n", n > 5 ? 250 - ans : n * n * n);
 return 0;
}