io.stdin:read("*l")
print((function (f, s)
	return f(s)
end)(function (s)
	local t,n,r = {},0,0
	for e in s:gmatch("%d+") do e=tonumber(e) n=n+e table.insert(t,e) end
	n = n/10
	for _,v in ipairs(t) do if v <= n then r = r+1 end end
	return r*30
end, io.stdin:read("*l")))