func main()
	var n: int :: cui@inputInt()
	var a: []int :: #[n]int
	var sum: int :: 0
	var mp: dict<int, int> :: #dict<int, int>
	for i(0, n - 1)
		do a[i] :: cui@inputInt()
		do sum :+ a[i]
		do mp.add(a[i] % 10, mp.get(a[i] % 10, &) + 1)
	end for
	
	const rMax: int :: 555
	var dp: []int :: [-1].repeat(rMax)
	do dp[0] :: n
	for i(1, 9)
		var num: int :: [10, mp.get(i, &)].min()
		for(1, num)
			for j(rMax - 1 - i, 0, -1)
				if(dp[j] <> -1)
					do dp[j + i] :: dp[j] - 1
				end if
			end for
		end for
	end for
	
	var target: int :: sum % 10
	var ans: int :: 0
	for i(target, rMax - 1, 10)
		if(dp[i] <> -1 & dp[i] > ans)
			do ans :: dp[i]
		end if
	end for
	
	do cui@print("\{ans}\n")
end func