557 B | 557 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
BLANK = " "
# inp = input
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n = ii()
l = [ii() for _ in range(n)]
ans = 11111111111111
for i in range(n):
ans = min(ans, l[i] + l[(i + 2) % n])
p(ans)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()