a = [0,1,2,3,4]
b = [5,6,7,8,9]
c = [10,20,30,40,50]

DO i = 2,4
　　　a(i) = a(i-1) + a(i+1)
　　　c(i) = b(i) * a(i+1)
END DO

a = [0,10,60,40,4]
b = [5,6,7,8,9]
c = [10,60,420,320,50]