#include <iostream>
#include <iomanip>
#include <vector>
#include <math.h>
#include <queue>
#include <deque>
#include <map>
#include <set>

using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define all(a) a.begin(), a.end()
#define arr(a) a.rbegin(), a.rend()
template<typename T> bool chmin(T& a, T b){if(a > b){a = b; return true;} return false;}
template<typename T> bool chmax(T& a, T b){if(a < b){a = b; return true;} return false;}
using ll = long long;

//Konishii

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n; cin >> n;
    string ans;
    rep(i, n/2) ans += '1';
    if(n%2 == 1) ans[0] = '7'; 
    cout << ans << endl;
}