#include<iostream>

using namespace std;

int main(void){
  int n;

  cin>>n;

  while(n>0){
    if(n%2==1&&n-3>=0){
      cout<<7;
      n=n-3;
    }else if(n-2>=0){
      cout<<1;
      n=n-2;
    }else{
      cout<<0;
      break;
    }
  }

  cout << '\n';

  return 0;
}