# your code goes here
'''
i=1
while i <=10:
    print(i)
    i +=1
'''

'''
i=2
while i<=20:
    print(i)
    i +=2
'''
'''
suma=0
i=1
while i<=50
suma +=1
i +=1
'''
'''
i=10
while i >=1:
    print(i)
    i -=1
'''

licznik=0
i=1
while i <=100:
    if i % 5 == 0:
        licznik +=1
    i += 1
print(licznik)

'''
suma=0
i=2
while i <=20:
    suma +=i
    i +=2
'''
'''
i=1
while i <= 15:
    print(i)
    i +=2
'''