#!/usr/bin/ python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from functools import lru_cache

A, *P = map(int, read().split())
P = tuple(x / 100 for x in P)

@lru_cache(None)
def f(N, i, rest_year, left_flag=False):
    """ N 本の歯があり、i-1番の歯まで虫判定を終えた"""
    if N == 0:
        return 0
    if rest_year == 0:
        return N
    if i == N:
        return f(N, 0, rest_year - 1)
    p = P[0] if N == 1 else P[1] if i in (0, N - 1) else P[2]
    if i == 0 and left_flag:
        p = P[1] if i == N-1 else P[2]
    # 抜く場合
    x = f(i, 0, rest_year - 1) + f(N - i - 1, 0, rest_year, True)
    # 抜かない場合
    y = f(N, i + 1, rest_year)
    return p * x + (1 - p) * y


answer = f(14, 0, 80 - A) * 2
print(answer)