求赞

#include <iostream>
using namespace std;

int main() {
long long n;
cin >> n;
int count = 0;

for (long long x = 0; x <= n / 7; ++x) {

    long long remainder = n - 7 * x;

    if (remainder >= 0 && remainder % 4 == 0) {
        long long y = remainder / 4;
        long long z = n - x - y; 

        if (z >= 0 && z % 3 == 0) {
            count++;
        }
    }
}

cout << count << endl;
return 0;

}