有如下代码：若输入的key值是73，则程序输出的结果是？（ ）

a = [25, 37, 49, 64, 73, 75, 85, 91]
t = i = 0
j = len(a) - 1
key = int(input())
while i <= j:
    m = (i + j) // 2
    if a[m] == key:
        break
    elif a[m] > key:
        j = m - 1
    else:
        i = m + 1
    t += 1
print(t)