For i=1 to 6
b(i)=a(i)
Next i
s=0
For i=2 to 6
if a(i)+a(i-1)<a(i) then b(i)=a(i)+a(i-1)
s=s+b(i)
数组元素a(1)到a(6)的值依次为“8,-2,5,7,-6,1”,执行该程序后,变量s的值为( )