#include "bits/stdc++.h"

#define REP(i,num) for(int i=0;i<(num);++i)
#define LOOP(i) while(i--)
#define ALL(c) c.begin(),c.end()
#define PRINTALL(c) for(auto pitr=c.begin();pitr!=c.end();++pitr){cout<<*pitr;if(next(pitr,1)!=c.end())cout<<' ';}cout<<endl;
#define PAIRCOMP(c,comp) [](const pair<ll,ll>& lhs,const pair<ll,ll>& rhs){return lhs.c comp rhs.c;}

using namespace std;
using ll = long long;

constexpr ll atcoder_mod = 1e9+7;

template<typename T=int>
T in(){T x; cin >> x; return (x);}
template<typename T=int,typename C=vector<T>>
C vecin(int N){C x(N);REP(i,N){x[i]=in<T>();}return move(x);}

void vout(){cout << endl;}
template<typename Head,typename... Tail>
void vout(Head&& h,Tail&&... t){cout << ' ' << h;vout(forward<Tail>(t)...);}
void out(){cout << endl;}
template<typename Head,typename... Tail>
void out(Head&& h,Tail&&... t){cout << h;vout(forward<Tail>(t)...);}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	cout<<fixed<<setprecision(10);

	pair<char,int> C[6]={{'1',2},{'7',3},{'4',4},{'5',5},{'9',6},{'8',7}};

	auto comp = [](const string& l,const string& r)->bool{
		if(l.length()<r.length()) return true;
		else if(r.length()==l.length()){
			return l<r;
		}
		return false;
	};

	int N=in();
	vector<string> dp(N+1,"");
	for(int i=0;i<N+1;i++){
		if(i && dp[i]=="") continue;
		for(int j=0;j<6;j++){
			if(i+C[j].second<=N){
				string T=dp[i+C[j].second];
				string S=C[j].first+dp[i];
				if(comp(T,S)) dp[i+C[j].second] = S;
			}
		}
	}
	
	out(dp[N]);
	return 0;
}