import sys

lines = [line.strip() for line in sys.stdin if line.strip()]
n = int(lines[0])

if len(lines) == 2:
    print('"assert"')
else:
    a = [int(lines[1]), int(lines[2]), int(lines[3])]
    s1 = a[0] + a[1]
    s2 = a[0] + a[2]
    s3 = a[1] + a[2]
    sums = {s1, s2, s3}
    sorted_sums = sorted(sums, reverse=True)
    print(sorted_sums[1])