#include <bits/stdc++.h>
using namespace std;

int main() {
    int N;
    cin>>N;
    if (N%2==0){
        int K = N/2;
        for (int i=0;i<(N/2);i++){
            cout<<'1';
        }
        cout<<endl;
    }
    else{
        cout<<'7';
        int K = (N-3)/2;
        for (int i=0;i<K;i++){
            cout<<'1';
        }
        cout<<endl;
    }
}