import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1]
mii = lambda x = " ": [*map(int,inp().split(x))]
mfi = lambda x = " ": [*map(float,inp().split(x))]
ii = lambda : int(inp())
while 1:
n = ii()
if n == 0:
break
l = mii()
ans = 0
for i in range(n):
if abs(l[i] - 2023) < abs(l[ans] - 2023):
ans = i
print(ans + 1)