a = list(map(int,input().split()))

k = 0
ans = 0
for i in range(N):
    k += a[i]
find = k/N
now = 1000000
for i in range(N):
    if abs(a[i]-find) < now - 0.00001:
        ans = i
        now = abs(a[i]-find)
print(ans)