#include <bits/stdc++.h>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-8;
const ll mod=1e9+7;
const int dx[4]={-1,0,1,0},dy[4]={0,-1,0,1};

int n;

int main(){
	cin>>n;
	if(n==1) cout<<555<<endl;
	else{
		int N=4;
		string s="3555";
		for(int i=2;i<n;i++){
			if(s.substr(N-4,3)=="333") s[N-4]=s[N-3]=s[N-2]='5';
			else{
				bool B=0;
				for(int i=N-2;i>0;i--) if(s[i-1]<s[i]){
					B=1;
					s[i-1]='5';
					for(int j=i;j<N-1;j++) s[j]='3';
					int t=0;
					for(int j=0;j<N;j++) if(s[j]=='5') t++;
					t=(3-t%3)%3;
					for(int j=N-2;j>=0&&t;j--) s[j]='5',t--;
					break;
				}
				if(!B){
					N++;
					s=string(N-3,'3')+"555";
				}
			}
		}
		cout<<s<<endl;
	}
}