// 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 X, int Y, int D) {
        // write your code in Java SE 8
    }
}

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    pass

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    if 

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    if N == 0:
        return 

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    i, j = N // D, N % D
    if j != 0:
        return 

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    i = N %%
    if N % D != 0:
        i += 1

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    i = N // D
    if N % D != 0:
        i += 1
    return i

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    i = N // D
    if N % D != 0:
        i += 1
    return i

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    i = N // D
    if N % D != 0:
        i += 1
    return i

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    if D
    i = N // D
    if N % D != 0:
        i += 1
    return i

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    if N == 0:
        return 0
    i = N // D
    if N % D != 0:
        i += 1
    return i

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    if N == 0:
        return 0
    i = N // D
    if N % D != 0:
        i += 1
    return i

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(X, Y, D):
    # write your code in Python 3.6
    N = Y - X
    if N == 0:
        return 0
    i = N // D
    if N % D != 0:
        i += 1
    return i