import numpy as np
s = list(map(int,input().split(' ')))
k1 = 0.025
x = 0
sec_arr=[]
filt=[]
i=0
s1=list()
while i<len(s):
    s1.append(s[i:i+255])
    i=i+256
for j in range(len(s1)):
    s1[j]=abs(np.fft.fft(s1[j]))
    s1[j]=s1[j][:int(len(s1[j])/2)]
area=0
for k in range(len(s1)):
    for l in range(0,5):
        area=area + (s1[k][8+l]+s1[k][9+l])/2
    sec_arr.append(area)
    area=0
rmax=sec_arr[0]
rmin=sec_arr[0]
limit = 10000
rmaxi = 0
step=[]
i = 0
u=10
while i < len(sec_arr) - u:
    step=sec_arr[i:i + u]
    rmin = sec_arr[i]
    rmax = sec_arr[i]
    for j in range(len(step)):
        if(step[j] > rmax):
                rmax = step[j]
                rmaxi = i + j
                break
        if(step[j] < rmin):
                rmin = step[j]
                rmini = i + j
    if rmaxi == i and rmax - rmin >= limit:
        x = x + 1
        i += 30
        if i >= len(sec_arr) - u:
            break
        rmaxi = i
    elif rmaxi == i and rmax - rmin < limit:
        i += 1
        rmaxi = i
    else:
        i = rmaxi
print(x)