from math import log2
N = int(input())
RP = [int(input()) for _ in range(N)]

sx1,x1 = 0,1
sx2,x2 = 0,1
Fi = 0.22941573387056197
F = [1]
gs = 0
for i in range(N):
    x1 *= 0.81
    x2 *= 0.9
    sx1 += x1
    sx2 += x2
    gs += 2 ** (RP[i]/800) * x2
F1 = 1
FN = sx1**0.5/sx2
fn = (FN - Fi)/(F1 - Fi) * 1200
ans = log2(gs/sx2)*800-fn
print(int(ans))