inp = int(input())

n = int(input())

a = n//15
b = n%15

ls = [i for i in range(1, b+1)]
#print(ls)

als = []
for i in ls:
    if i % 15 == 0:
        als.append('FizzBuzz')
    elif i % 5 == 0:
        als.append('Buzz')
    elif i % 3 == 0:
        als.append('Fizz')
    else:
        als.append(str(i))
#print(als)
ans = "".join(als)
c = ans.count('z')
print(a*16 + c)