素数判定
You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.
Background
Description
对于表达式n^2+n+41,当n在(x,y)范围内取整数值时(包括x,y)(-39<=x<y<=50),判定该表达式的值是否都为素数。
Format
Input
输入数据有多组,每组占一行,由两个整数x,y组成,当x=0,y=0时,表示输入结束,该行不做处理。
Output
对于每个给定范围内的取值,如果表达式的值都为素数,则输出"OK",否则请输出“Sorry”,每组输出占一行。
Samples
0 1
0 0
OK
Limitation
1s, 1024KiB for each test case.