For simplicity, we'll assume that there are only three types of grapes: green grapes, purple grapes and black grapes.Andrew, Dmitry and Michal are all grapes' lovers, however their preferences of grapes are different. To make all of them happy, the following should happen:. Knowing that his friends are so fond of grapes, Aki decided to host a grape party with them. He has prepared a box with aa green grapes, bbpurple grapes and cc black grapes.However, Aki isn't sure if the box he prepared contains enough grapes to make everyone happy. Can you please find out whether it's possible to distribute grapes so that everyone is happy or Aki has to buy some more grapes?It is not required to distribute all the grapes, so it's possible that some of them will remain unused.The first line contains three integers xx, yy and zz — the number of grapes Andrew, Dmitry and Michal want to eat.If there is a grape distribution that allows everyone to be happy, print "YES", otherwise print "NO". 阅读全文