#include <iostream>
#include <algorithm>
#include <math.h>
using namespace std;

int main(){
    int n, a, b;
    b = 1;
    cin >> n;
    if (n % 2 == 1) b = 7;
    a = n / 2 - 1;
    for ( int i = 0; i < a; i++ ) cout << 1;
    cout << b << endl;
    
    return 0;
}