n = int(input())
a = [int(input()) for _ in range(n)]

j = -1
b = 0
for i in range(n):
    if b < a[i]:
        b = a[i]
        j = i
ans = 1
for i in range(n):
    if j == i:
        continue
    if a[i] + 1 >= a[j]:
        ans += 1
print(ans)