import sys
from itertools import count
from math import gcd

from typing import List, Tuple


def int1(x: str, /): return int(x) - 1


def input(): return sys.stdin.readline().rstrip('\n')


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()), sep='; ', file=sys.stderr)


def main():
    L = int(input())
    ans = 0
    for u in count(1):
        if 4 * (u * u - 1 + 2 * u + u * u + 1) > L:
            break
        for v in range(1, u):
            if gcd(u, v) == 1 and u % 2 != v % 2:
                a, b, c = u * u - v * v, 2 * u * v, u * u + v * v
                s = 4 * (a + b + c)
                if s > L: break
                ans += 1
    return ans


def _start():
    ret = main()

    if ret is not None:
        if isinstance(ret, List) or isinstance(ret, Tuple):
            print(*ret)
        else:
            print(ret)


if __name__ == '__main__':
    _start()