#include <fstream>
using namespace std;
ifstream fin("pascal.in");
ofstream fout("pascal.out");
int R,D, sol, main_two, main_five, two, five, main_three, three, d2, d3, d5;

int get_pow(long long N, long long P) {
	int nr = 0, cnt = 0;
	while(P <= N) {
    cnt += 1;
		nr += N / P;
		P = P * P;

    if (cnt > 3)
      break;
	}
	
	return nr;
}

int main() {
	// your code goes here
	fin >> R >> D;
	
	main_two = get_pow(R, 2);
	main_five = get_pow(R, 5);
  main_three = get_pow(R, 3);
  d2 = D/2;
  d3 = D/3;
  d5 = D/5;
	for (int j = 0; j<= R; j++) {
		two = main_two - get_pow(j, 2) - get_pow(R - j, 2);
		five = main_five - get_pow(j, 5) - get_pow(R - j, 5);
    three = main_three - get_pow(j, 3) - get_pow(R - j, 3);
		if (two >= d2 && five >= d5 && three >= d3)
			sol++;
	}
	fout << sol;
	return 0;
}