count = 0
n = int(input("Enter the size: "))  
list = []  

print("Enter the elements:")  # Enter 0's and 1's
for i in range(0, n):  
    num = int(input())  
    list.append(num)  

for i in range(0, n):  
    if (list[i] == 1 and list[i + 1] == 1):  
        count = count + 1  
    else:  
        if list1[i] == 0 and list1[i + 1] == 0:  
            count = 0  

print("Max number of consecutive 1's is", count + 1)