import sys
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():
    n = int(input())
    e = [True] * (n + 1)
    e[0] = e[1] = False
    for i in range(2, n + 1):
        if e[i]:
            for j in range(i * i, n + 1, i):
                e[j] = False

    ans = 0
    for r in range(n + 1):
        if r * r > 2 * n:
            break
        if not e[r]:
            continue
        for p in range(2, min(r * r, n + 1)):
            if not e[p]:
                continue
            q = r * r - p
            if 0 <= q <= n and e[q]:
                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()