1 + 5 of 6 + 11 of 12 + 23 of 24 + 47 of 48 + 95 of 96 + 191 of 192 Simple operation

1 + 5 of 6 + 11 of 12 + 23 of 24 + 47 of 48 + 95 of 96 + 191 of 192 Simple operation

What grade is yuo?