#include<bits/stdc++.h>
//#include"atcoder/all"
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define all(a) (a).begin(),(a).end()
using namespace std;
//using namespace atcoder; 
int main(){
  //1->2,7->3
  int N;cin >> N;
  if(N%2) cout << "7" << string(N/2-1,'1') << "\n";
  else cout << string(N/2,'1') << "\n";
}