#include <iostream> using namespace std; int main() { int N; cin >> N; int count = 0; for (int a = 1; a <= N; a++) { // 百位不能为0 for (int b = 0; b <= N; b++) { for (int c = 1; c <= N; c += 2) { // 个位必须是奇数 if (a != b && b != c && a != c) { count++; } } } } cout << count << endl; return 0; }