"""
[21945: Palindromes](https://www.acmicpc.net/problem/21945)
Tier: ??
Category: 문자열
"""
from re import L
def solution():
s = 0
input()
for i in map(int, input().split()):
st = str(i)
if st == st[::-1]:
s += i
return s
if __name__ == '__main__':
print(solution())