[問題] 算sigma

[Laoda245566 (草莓獸)]

Program example1
        integer x,sum,i
        write(*,*)"x"
        read(*,*) x
        sum=0
        do i=1,30,1
        sum=sum+x+2i--------------(1)
        end do
        write(*,*)"sum=",sum
        end

(1)顯示說unclassifiable statement

請問錯在哪?

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