#include <iostream>
#include <cstdlib>
#include <cstdio>

int A[7];

using namespace std;

int verif(int D)
{
    if ( D == 4 && A[2] > 1)
    {
        return 1;
    }
    if (D == 6 && A[2]> 0 && A[3] > 0)
    {
        return 1;
    }
    if (A[D] > 0)
    {
        return 1;
    }
    return 0;
}

int get_divs(int a , int b)
{

        while (a % 2 == 0)
        {
             a /= 2;
             A[2] ++;
        }
        while (a % 3 == 0)
        {
            a /= 3;
            A[3] ++;
        }
        while (a % 5 == 0)
        {
             a /= 5;
             A[5]++;
        }
        while (b % 2 == 0)
        {
            b /= 2;
            A[2] --;
        }
        while (b % 3 == 0)
        {
             b /= 3;
             A[3] --;

        }
        while (b % 5 == 0)
        {
            b /= 5;
            A[5]--;
        }

}

int main()
{
    FILE *input = fopen("pascal.in","r");
    FILE *output = fopen("pascal.out","w");
    int N, D;
    fscanf(input,"%d%d",&N,&D);
    int M = N;
    int raspuns = 0;
    for (int i = 1;i<=(M/2);i++,N--)
    {
        get_divs(N,i);

        if (verif(D) == 1)
        {
            raspuns += 2;
        }
    }
    if (M % 2 == 0 && verif(D))
    {
        raspuns --;
    }
    fprintf(output,"%d",raspuns);
    fclose(input);
    fclose(output);

    return 0;
}