from collections import deque
from itertools import combinations

lines = [int(x.strip()) for x in open("input.txt")]
L = 25

buffer = deque(maxlen=L)
result = None

for line in lines:
    if len(buffer) == L:
        found = any(a + b == line for a, b in combinations(buffer, 2))
        if not found:
            result = line
            break
    buffer.append(line)

if result is None:
    print("No value found")
    exit(0)

for start in range(len(lines)):
    add = 0
    for end in range(start, len(lines)):
        add += lines[end]
        if add == result:
            mi = min(lines[start:end+1])
            ma = max(lines[start:end+1])
            print(mi+ma)
            exit(0)
        elif add > result:
            break