#define _USE_MATH_DEFINES #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include typedef long long int ll; //#include using namespace std; ll gcd(ll a, ll b) { if (a < b)swap(a, b); if (b == 0)return a; return gcd(b, a % b); } int lcm(int a, int b) { return a * b / gcd(a, b); } int main() { int Q; Q = 1; //cin >> Q; while (Q--) { vectorf(10005); f[2] = 1; vectorx; x.push_back(2); for (int i = 3; i <= 10000; i += 2) { f[i] = 1; for (int j = 3; j * j <= i; j += 2) { if (i % j)continue; f[i] = 0; break; } if (f[i])x.push_back(i); } vectory(10005,1000000); y[2] = 1; y[3] = 1; for (int i = 4; i <= 10000; i++) { for (int j = 0; j < x.size(); j++) { if (x[j] > i)break; if (y[i - x[j]] == 1000000 || (y[i - x[j]] + 1) % 2)continue; y[i] = min(y[i], y[i - x[j]] + 1); } } int n; cin >> n; //for (int i = 0; i <= n; i++)cout<