#include<stdio.h>
//#include<bits/stdc++.h>
#include<string.h>
#include<iostream>
#include<math.h>
#include<sstream>
#include<set>
#include<queue>
#include<vector>
#include<algorithm>
#include<limits.h>
#define inf 0x3fffffff
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define LL long long
using namespace std;
int main()
{
    LL k,a,b;
    LL ans=0;
    while(cin>>b>>k)
    {
        LL ans=0;
        a=0;
        if(a<0&&b<0)
        {
            ans+=(-a)/k-(-b)/k;
            if((-b)%k==0)
            {
                ans++;
            }
        }
        else if(a<0&&b==0)
        {
            ans+=(-a)/k;
            ans++;
        }
        else if(a<0&&b>0)
        {
            ans+=(b)/k+(-a)/k;
            ans++;
        }
        else if(a==0&&b>0)
        {
            ans+=(b)/k;
            ans++;
        }
        else if(a>0&&b>0)
        {
            ans+=(b)/k-(a)/k;
            if(a%k==0)
            {
                ans++;
            }
        }
        else if(a==0&&b==0)
        {
            ans++;
        }
        cout<<ans<<endl;
    }
    return 0;
}