#!/bin/python3
import sys

times = [int(x) for x in input().split(":")[1].split()]
distances = [int(x) for x in input().split(":")[1].split()]
races = [(times[i], distances[i],) for i in range(len(times))]

def distance_for_race_len(race_len, hold_time):
  if hold_time <= 0: return 0
  if hold_time >= race_len: return 0
  return round((race_len - hold_time) * hold_time)

output = 1
for max_time, record_dist in races:
  possible_distances = [distance_for_race_len(max_time, x) for x in range(max_time)]
  possible_distances = list(enumerate(possible_distances))
  possible_distances = [p for p in possible_distances if p[1] > record_dist]

  output *= len(possible_distances)

print(f">> {output}")