import sys
read=sys.stdin.buffer.read
readline=sys.stdin.buffer.readline
readlines=sys.stdin.buffer.readlines

n=int(readline())
d=list(map(int, readline().split()))
c=[0]*(1<<n)
dp=[0]*(1<<n)
for i in range(1<<n):
    for j, x in enumerate(d):
        if x<0 and i&(1<<j):
            c[i]+=1
dp[0]=100
for i, (x, t) in enumerate(zip(dp, c)):
    if x==0:
        continue
    for j, y in enumerate(d):
        if i&(1<<j):
            continue
        if x+y>0:
            x1=min(x+y, (t+1)*100)
            if dp[i^(1<<j)]<x1:
                dp[i^(1<<j)]=x1
print(dp[(1<<n)-1])