// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int solution(int A, int B, int K) {
        // write your code in Java SE 8
    }
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, B, K) {
    // write your code in JavaScript (Node.js 8.9.4)
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, B, K) {
    return Math.floor(B / K) Math.floor(A / K)
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, B, K) {
    return Math.floor(B / K) - Math.floor(A / K)
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, B, K) {
    return Math.floor(B / K) - Math.floor(A / K) + 
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, B, K) {
    return Math.floor(B / K) - Math.floor(A / K) + A % K === 0 ? 0 : 1
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, B, K) {
    return Math.floor(B / K) - Math.floor(A / K) + (A % K === 0 ? 0 : 1)
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, B, K) {
    return Math.floor(B / K) - Math.floor(A / K) + (A % K === 0 ? 1 : 1)
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, B, K) {
    return Math.floor(B / K) - Math.floor(A / K) + (A % K === 0 ? 1 : 0)
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, B, K) {
    return Math.floor(B / K) - Math.floor(A / K) + (A % K === 0 ? 1 : 0)
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, B, K) {
    return Math.floor(B / K) - Math.floor(A / K) + (A % K === 0 ? 1 : 0)
}