#!/usr/bin/env python3
import math
import re

lines = (x.strip() for x in open("input.txt"))
times = []
records = []

for line in lines:
    if line.startswith("Time"):
        times = tuple(map(int, re.findall("\d+", line)))
    else:
        records = tuple(map(int, re.findall("\d+", line)))

result = 1
for t, r in zip(times, records):
    pmin = (t-(t**2-4*r)**0.5)/2
    pmax = (t+(t**2-4*r)**0.5)/2
    result *= math.floor(pmax) - math.ceil(pmin) + 1

print(result)