#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; i++)
#define INF 100000000
using namespace std;

int n;

int main(){	
	cin >> n;
	if(n%2){
		cout << 7;
		rep(i,(n-3)/2) cout << 1;
		cout << endl;
	} else{
		rep(i,n/2) cout << 1;
		cout << endl;
	}
}