#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using ld = long double;

#define rep(i, r) for(int i = 0; i < (r); ++i)
#define reps(i, s, r) for(int i = (s); i < (r); ++i)
#define rrep(i, a, b) for(int i = a; i >= b; i--)
#define fore(i, m2) for(auto &i : m2)
#define vi vector<int>
#define vl vector<ll>
#define pl pair<ll, ll>
#define all(i) (i).begin(), (i).end()
#define fs first
#define sc second

template <class T> bool chmin(T &i, T b) {
    if(i > b) {
        i = b;
        return true;
    }
    return false;
}
template <class T> bool chmax(T &a, T b) {
    if(a < b) {
        a = b;
        return true;
    }
    return false;
}

const ll INF = LONG_LONG_MAX / 3;
const ll MOD = 1'000'000'007;
const ll MAX = 1e5 + 5;

#define EPS 0.000000001
using namespace std;

ll addOne(ll num, ll cnt) {

    for(int i = 0; i < cnt; i++) {
        num *= 10;
        num += 1;
    }
    return num;
}

int main() {

    ll n;
    cin >> n;

    ll ans = 0;
    if(n % 2 == 1) {
        ans = 7;
        ans = addOne(ans, (n - 3) / 2);
    } else {
        ans = addOne(ans, n / 2);
    }

    cout << ans << endl;
}