循环语句

#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;

    int count = 0;
    for (int a = 1; a < n; a++) {
        for (int b = a + 1; b < n; b++) {
            int c = n - a - b;
            if (c > b) {
                count++;
            }
        }
    }

    cout << count << endl;

    return 0;
}