cf462 A Compatible Pair

找多少個圈，我記得小學找規律的題目

B. A Prosperous Lot

time limit per test

1 second

memory limit per test

256 megabytes

input

standard input

output

standard output

Apart from Nian, there is a daemon named Sui, which terrifies children and causes them to become sick. Parents give their children money wrapped in red packets and put them under the pillow, so that when Sui tries to approach them, it will be driven away by the fairies inside.

Big Banban is hesitating over the amount of money to give out. He considers loops to be lucky since it symbolizes unity and harmony.

He would like to find a positive integer n not greater than 10¹⁸, such that there are exactly k loops in the decimal representation of n, or determine that such n does not exist.

A loop is a planar area enclosed by lines in the digits' decimal representation written in Arabic numerals. For example, there is one loop in digit 4, two loops in 8 and no loops in 5. Refer to the figure below for all exact forms.

Input

The first and only line contains an integer k (1 ≤ k ≤ 10⁶) — the desired number of loops.

Output

Output an integer — if no such n exists, output -1; otherwise output any such n. In the latter case, your output should be a positive decimal integer not exceeding 10¹⁸.

Examples

Input

2

Output

462

Input

6

Output

8080

#include<iostream>
#include<algorithm>
using namespace std;
typedef long long ll;
#define f(i,l,r) for(int i=l;i<=r;i++)
#define g(i,l,r) for(int i=l;i>=r;i--)
 //888888888888888888 18* 2  === 36

int main()
{
	int n;
	cin>>n;
	if(n>36)cout<<-1<<endl;
	else
	{
		if(n%2==1) cout<<1;
		f(i,1,n/2) cout<<8;
		cout<<endl;
	}
	return 0;
}

未來的我一定會感謝現在正在成長的我