A = list(map(int, input().split()))
B = []

for i in A:
    if i % 3 == 0 and i % 5 == 0:
        B.append("FizzBuzz")
    elif i % 3 == 0 and i % 5 != 0:
        B.append("Fizz")
    elif i % 5 == 0 and i % 3 != 0:
        B.append("Buzz")
    else:
        B.append(i)

charString = list(map(str, B))
output = ''.join(charString)

print(len(output))