A = int(input())
P = list(map(int,input().split()))
N = 80 - A
dp = [[0] * (1 << 14) for _ in range(N+1)]
dp[0][-1] = 1
for j in range(N):
    for bit in range(1 << 14):
        T = bit
        while True:
            tmp = 1
            for i in range(14):
                mask = 1 << i
                if bit & mask == 0:
                    continue
                count = 0
                if i > 0:
                    if bit & (mask >> 1):
                        count += 1
                if i < 13 and bit & (mask << 1):
                    count += 1
                if T & mask:
                    tmp *= (100 - P[count]) / 100
                else:
                    tmp *= P[count] / 100
            dp[j+1][T] += dp[j][bit] * tmp
            if T == 0:break
            T -= 1
            T &= bit
ans = 0
for bit in range(1 << 14):
    num = bin(bit).count('1')
    ans += num * dp[-1][bit]
print(ans * 2)