#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;
const int INF = 1e+9;
const ll LINF = (ll)pow(10,18);

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

    int anslen, sevencount;
    anslen = 0; sevencount = 0;

    for(int i=1; i<=50000; i++){
        for(int j=0; j<=i; j++){
            if(j * 3 + (i - j) * 2 <= n){
                anslen = i;
                sevencount = j;
            }
        }
    }

    for(int i=0; i<anslen; i++){
        if(i < sevencount) cout << 7;
        else cout << 1;
    }

    cout << "\n";
}