s=input().split()
m,sum=0,0
k=1 
for i in range(12):
	m+=300
	m-=int(s[i])
	if m<0:
		k=-(i+1)
		break
	f=(m//100)*100
	sum+=f
	m-=f
if k<0:
	print(k)
else:
	print(int(sum+sum*0.2+m))