#include <bits/stdc++.h>

using namespace std;
typedef unsigned long long ull ;
ifstream f("pascal.in");
ofstream g("pascal.out");

ull putere(ull n,ull div)
{
    ull s=0,p=div;
    while (n/div)
    {
        s+=n/div;
        div*=p;
    }
    return s;
}

int main()
{
    ull r,d,s=0,inloc=0,a,b,c;
    f>>r>>d;
    for (ull i=1;i<=r;++i)
    {
        a=putere(r,d); b=putere(r-i,d); c=putere(i,d);
        if (a-b-c>=1)
        {
            s++;
        }
    }
    g<<s;
    return 0;
}