#include <cmath>
#include <iostream>

using namespace std;

bool readInput(long *res){
//  cerr << "readInput start" << endl;
  if(cin >> res[0]){
     return cin >> res[1];
  }return false;
   
}

int main(){
  long *arr = new long[2];
  long count = 0;
  while(readInput(arr)){
  //  cerr << "while in" << endl;
    count = 0;
    long k = arr[1];
    long n = arr[0];
    long a = 1;
    long b = 1;
    for(long i = 1;i<=k;i++){
      b = b*(i);
      a = a*(n-i+1);
    }
    //cerr << b;
    long c = a/b;
    double c_sqrt = sqrt(static_cast<double>(c));
    
    for(long i = 1;i < static_cast<long>(c_sqrt)+1; i++){
      if(c%i==0)count+=2;  
    }
    if(c_sqrt - static_cast<long>(c_sqrt)==0)count++;
    cout << count << endl;
  }
  return 0;
}