#include<fstream>
using namespace std;
ifstream in ("pascal.in");
ofstream out ("pascal.out");
int k,d,fact[6],sol,y,i;
int main (void) {
    in >> k >> d;
    i = k;
    for (int j = 0; j < k; j ++) {
        if (j > 0) {
            if (d == 4) {
                if (fact[2] > 1) {
                    sol ++;
                }
            }
            else
            if (d == 6) {
                if (fact[2] > 0 && fact[3] > 0) {
                    sol ++;
                }
            }
            else {
                if (fact[d] > 0) {
                    sol ++;
                }
            }
        }
        if (j < k) {
            for (int h = 2; h <= 5; h ++) {
                if (h == 4) continue;
                y = j+1;
                while (y % h == 0) {
                    fact[h] --;
                    y /= h;
                }
                y = i-j;
                while (y % h == 0) {
                    fact[h] ++;
                    y /= h;
                }
            }
        }
    }
    out << sol;
    return 0;
}