---

import math
import sys

SERIES = (0.5, 0.75, 1.0, 1.5, 2.5, 4.0, 6.0, 10.0)


def parse_length(s):
    try:
        v = int(s)
    except (TypeError, ValueError):
        return None
    return v if 1 <= v <= 100 else None


def parse_section(s):
    try:
        v = float(s)
    except (TypeError, ValueError):
        return None
    for x in SERIES:
        if abs(v - x) < 1e-9:
            return x
    return None


def main():
    tok = sys.stdin.readline().split()

    length = parse_length(tok[0] if len(tok) > 0 else None)
    section = parse_section(tok[1] if len(tok) > 1 else None)

    if length is None and section is None:
        print(999)
    elif length is None:
        print(777)
    elif section is None:
        print(888)
    else:
        R = 0.0175 * 2 * length / section
        I = 0.10 * 220 / (R * 0.95)
        res = math.floor(I + 0.5)
        print(max(1, min(64, res)))


main()