#include<bits/stdc++.h>
using namespace std;

#define int long long
#define pb emplace_back
#define sz(v) (int)(v.size())
#define all(v) (v.begin(),v.end())

signed main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	// freopen("input.txt","r",stdin);
	// freopen("output.txt","w",stdout);
	int n;
	cin >> n;
	if(n%2 == 1){
		cout << "7";
		for(int i = 0;i<n/2 - 1;i++){
			cout << "1";
		}
	}
	else{
		for(int i = 0;i<n/2;i++){
			cout << "1";
		}
	}
	cout << endl;
	return 0;
}