#include <iostream> using namespace std; int main() { int N; cin >> N; int total = N * 10; int count = 0; for (int ballpen = 1; ballpen <= total / 8; ballpen++) { for (int pencil = 1; pencil <= total; pencil++) { for (int pencilLead = 1; pencilLead <= total; pencilLead++) { if (ballpen * 8 + pencil * 2 + pencilLead * 1 == total && ballpen + pencil + pencilLead > 30) { count++; } } } } cout << count << endl; return 0; } /************************************************************** Problem: 1024 User: wengzihang Language: C++ Result: Accepted Time:8 ms Memory:2072 kb ****************************************************************/