#include "stdafx.h"
#include <fstream>
#include <string.h>
#include <conio.h>
using namespace std;

int main()
{int n,m,p; int k;
	ifstream cin("problem.in");
	ofstream cout("problem.out");
cin>>n>>m;
p=0;
for(int j=1; j<=n; j++)
{
k=((double)(1+j)/2)*j;
if(k%m==0) {p++; }
}
cout<<p<<endl;
cin.close();
	cout.close();
		return  0;
}