#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 100000000000000000


int main(){
	
	int N;
	cin>>N;
	
	string ans(N/2,'1');
	if(N%2==1)ans[0] = '7';
	cout<<ans<<endl;
	
	return 0;
}