count = 0def towers_of_honoi(A,B,C,n):global countif n == 1:disk = A.pop()C.append(disk)count += 1else:tower_of_honoi(A,C,B,n-1)tower_of_honoi(A,B,C,1)tower_of_honoi(B,A,C,n-1)return count error is A not defined

Hi Viraj, thanks for reaching out! You need to define A, B and C, which represent the towers we want to stack. Try the following code before the def towers_of_hanoi: A = [3,2,1]B = []C = [] Best, Eli