#include #include #include using namespace std; bool check(int x) { while (x) { if (x % 10 == 2 || x % 10 == 4) return false; x /= 10; } return true; } int main() { int ans = 0; for (int i = 1; i < 2019; i++) { if (!check(i)) continue; for (int j = i + 1; j < 2019; j++) { int k = 2019 - i - j; if (k > j && check(j) && check(k)) ///此处记得j,k都要check ans++; } } printf("%d\n", ans); return 0; }