"""
That's odd...  
 
You want to take a list of numbers and find the sum of all of the even numbers in the list. Ignore any odd numbers. 
 
Task: 
Find the sum of all even integers in a list of numbers. 
 
Input Format:  
The first input denotes the length of the list (N). The next N lines contain the list elements as integers. 
 
Output Format:  
An integer that represents the sum of only the even numbers in the list. 
 
Sample Input:  
9 
1 
2 
3 
4 
5 
6 
7 
8 
9 
 
Sample Output:  
20
"""

N = int(input()) 
data = list(int(input()) for i in range(N))
data2=[]
for i in data:
    if i%2==0:
        data2.append(i)
print(sum(data2))
