# -*- coding: utf8 -*-
import sys
i = 1
for s in sys.stdin:
s = s.strip()
if i == 2:
n = s.split(" ")
print(max(n[:]))
else:
i = i + 1
# -*- coding: utf8 -*-
import sys
i = 1
for s in sys.stdin:
s = s.strip()
if i == 2:
n = s.split(" ")
print(max(n[:]))
else:
i = i + 1
split 傳回的 list 是由字串構成,
而字串是以字典序比較大小,例如 '9' > '10'。