7fed8272b48268f751ed87e54e8372730209bdbb09212eb7c4f66247f65b39b0

7fed8272b48268f751ed87e54e827473c5506da19a185ceb8a2abe5ac2de3f76

r<R일때 계산하려는데 어떻게하죠 ㅠㅠ