#´. 素数判定

    Type: Default 1000ms 256MiB

素数判定

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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.

第七届SWPU-ACM老生预选赛

Not Attended
Status
Done
Rule
ACM/ICPC
Problem
187
Start at
2022-9-19 14:00
End at
2022-10-28 14:00
Duration
936 hour(s)
Host
Partic.
45