#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <functional>
#include <set>
#include <cstring>

using namespace std;

int main()
{	
	int n;
	cin>>n;

	if(n==3){cout<<7<<endl;}
	else{
		string s;
		while(n>=2){n-=2; s+='1';}
		cout<<s<<endl;
	}

	return 0;

}