#include <iostream>
#include <cstdlib>
#include <vector>
#include <climits>
#include <algorithm>
#include <cmath>
#include <tuple>
#include <set>
#include <iomanip>

using namespace std;

int main()
{
    int n;
    cin >> n;
    string s;
    while(n != 0) {
        if(n%2==0) {
            s.push_back('1');
            n-=2;
        } else if(n>=3){
            s.push_back('7');
            n-=3;
        } else
            break;
    }
    reverse(s.begin(), s.end());
    cout << s << endl;
}