执行如下程序SET TALK OFFS=0I=1INPUT "N=" TO NDO WHILE S<=NS=S＋II=I＋1ENDDO

执行如下程序

SET TALK OFF

S=0

I=1

INPUT "N=" TO N

DO WHILE S<=N

S=S+I

I=I+1

ENDDO

？S

SET TALK ON

如果输入值为5，则最后S的显示值是()。

A.1

B.3

C.5

D.6