#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.14159265359;
ll inf=10010010010010010;
ll mod=998244353;
int main(){
    ll n;
    cin >> n;
    if (n%2)
    {
        cout << '7';
        n-=1;
        n/=2;
        n-=1;
        for (ll i = 0; i < n; i++)
        {
            cout << '1';
        }
        cout << endl;
    }else{
        n/=2;
        for (ll i = 0; i < n; i++)
        {
            cout << '1';
        }
        cout << endl;
    }
    
}