spend = []
last = 0
this = 0
save = 0
flag = 0
for x in range(12):
    spend.append(int(input()))
for i in range(12):
    this = last+300
    if this - spend[i] >= 100:
        save += int(str((this-spend[i])//100)+'00')
        this = (this - spend[i])%10
    elif this - spend[i] < 0:
        print('-'+str(i+1))
        flag = 1
        break
    last = this
if flag == 0:
    print('%d' %(last+save*1.2))