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

lines = (x.strip() for x in open("input.txt"))
t = 0
r = 0

for line in lines:
    if line.startswith("Time"):
        t = int(re.sub("[^\d]", "", line))
    else:
        r = int(re.sub("[^\d]", "", line))

pmin = (t-(t**2-4*r)**0.5)/2
pmax = (t+(t**2-4*r)**0.5)/2
print(math.floor(pmax) - math.ceil(pmin) + 1)