why am i getting a c$1$ error isnt defined in this code. class Chicken:

total$\_$eggs $=0$

def $\_\_$init$\_\_($self$,$ name, species$)$:

self.name $=$ name

self.species $=$ species

self.eggs $=0$

def lay$\_$egg$($self$)$:

self.eggs $+=1$

Chicken.total$\_$eggs $+=1$

return Chicken.total$\_$eggs

c$1=$ Chicken$($name$=$"Alice", species$=$"Partridge Silkie"$)$

c$2=$ Chicken$($name$=$"Amelia", species$=$"Speckled Sussex"$)$

print$($Chicken$.$total$\_$eggs$)$

print$($c$1.$total$\_$eggs$())$

print$($Chicken$.$total$\_$eggs$)$

print$($c$2.$lay$\_$egg$())$

print$($c$2.$lay$\_$egg$())$

print$($Chicken$.$total$\_$eggs$)$