#define _CRT_SECURE_NO_WARNINGS #include #include #include #include #include #include #include #include #include #include #include #include #include //#include "util.h" using namespace std; typedef long long ll; typedef unsigned long long ull; #define PI 3.14159265358979323846 #define EPS 1e-6 #define MIN(a,b) ((a)<(b)?(a):(b)) #define MAX(a,b) ((a)>(b)?(a):(b)) #define CHAR_BIT 8 #define all(x) (x).begin(), (x).end() template ostream& operator << (ostream& ostr, const vector<_Ty>& v) { if (v.empty()) { cout << "{ }"; return ostr; } cout << "{" << v.front(); for (auto itr = ++v.begin(); itr != v.end(); itr++) { cout << ", " << *itr; } cout << "}"; return ostr; } int yuki0106() { int i, N, K; cin >> N >> K; int* f = new int[N + 1](); for (i = 2; i <= N; i++) { if (f[i]) continue; for (int j = i; j <= N; j += i) f[j]++; } int ans = 0; for (i = 2; i <= N; i++) if (f[i] >= K) ans++; cout << ans << endl; return 0; } int main() { //clock_t start, end; //start = clock(); yuki0106(); //end = clock(); //printf("%d msec.\n", end - start); return 0; }