Is there a better way or more efficient way to write this IF statement?

I need a way to get the return number to increase by "1" after every increment of "10". Is there a more efficient way to do this other than:

=SUM(
IF(AC11<10,0,
IF(AC11<20,1,
IF(AC11<30,2,
IF(AC11<40,3,
IF(AC11<50,4,
IF(AC11<60,5,
IF(AC11<70,6,
IF(AC11<80,7,
IF(AC11<90,8,
IF(AC11<100,9,
IF(AC11<110,10,
IF(AC11<120,11,
IF(AC11<130,12,
IF(AC11<140,13,
IF(AC11<150,14,
IF(AC11<160,15,)
))))))))))))))))