# n = list(map(int, input().split()))
# a = 0
# v = 0 # variable
#
# for i in range(len(n)):
# if n[i] % 2 == 1:
# a += n[i]
# v = 1
#
# if v == 1:
# print(a)
# else:
# print(-1)
# n = list(map(int, input().split()))
# x = n[0]
# y = n[1]
# k = 0
# if x > y :
# for i in range(1, x+1):
# if x % i == 0 and y % i == 0:
# k = i #최대공약수
# else:
# for i in range(1, y+1):
# if x % i == 0 and y % i == 0:
# k = i
#
# print(k)
# print((x*y) // k )
# (x*y)/최대공약수 == 최소공배수
n = []
for i in range(9):
x = int(input())
n.append(x)
for j in range(len(n)):
if n[i] > i:
print(i)