#!/usr/bin/env python3
# https://www.hackerrank.com/challenges/kangaroo

def kangaroo(x1, v1, x2, v2):
    # Complete this function
    if v1 > v2 and ((x2 - x1) % (v1 - v2)) == 0:
        return "YES"
    return "NO"

x1, v1, x2, v2 = input().strip().split(' ')
x1, v1, x2, v2 = [int(x1), int(v1), int(x2), int(v2)]
result = kangaroo(x1, v1, x2, v2)
print(result)

#!/usr/bin/env python3
# https://www.hackerrank.com/challenges/kangaroo

def kangaroo(x1, v1, x2, v2):
    # Complete this function
    if v1 > v2 and ((x2 - x1) % (v1 - v2)) == 0:
        return "YES"
    return "NO"

x1, v1, x2, v2 = input().strip().split(' ')
x1, v1, x2, v2 = [int(x1), int(v1), int(x2), int(v2)]
result = kangaroo(x1, v1, x2, v2)
print(result)

#!/usr/bin/env python3 # https://www.hackerrank.com/challenges/kangaroo # Complete this function