#include <iostream>
#include <algorithm>
using namespace std;
 
int main(){
    int N;
    cin >> N;
    for(int i = 1; i < N / 2; i++){
        cout << 1;
    }
    if(N % 2 == 0){
        cout << 1 << endl;
    }else{
        cout << 7 << endl;
    }
}