require 'prime'

X, A, Y, B = gets.split.map(&:to_i)

x_prime = X.prime_division.map { |e, cnt| [e, A * cnt] }.to_h
y_prime = Y.prime_division.map { |e, cnt| [e, B * cnt] }.to_h

y_prime.each do |e, cnt|
  if x_prime[e].nil?
    puts 'No'
    exit
  elsif x_prime[e] < cnt
    puts 'No'
    exit
  end
end

puts 'Yes'