#include <iostream>
#include <string>
using namespace std;

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

  return 0;
}