def kangaroo(x1, v1, x2, v2):
    # Write your code here
    if (x1 - x2) * (v1 - v2) < 0:
        if abs(x1 - x2) % abs(v1 - v2) == 0:
            return "YES"
        else:
            return "NO"
    else:
        return "NO"