def atoi(x):
    if x == '':
        return 0
    else:
        return int(x)


_ = int(input())
s = input()
n = len(s)
l = r = n // 2
while l >= 0 and s[l] == '0':
    l -= 1
while r < n and s[r] == '0':
    r += 1
if l == r:
    print(min(atoi(s[:sp]) + atoi(s[sp:]) for sp in [n // 2, (n + 1) // 2]))
else:
    print(min(atoi(s[:sp]) + atoi(s[sp:]) for sp in [l, r]))