774C - Maximum Number - CodeForces Solution

#include <bits/stdc++.h>
typedef long long ll;
typedef long double ld;
#define fi first
#define se second
#define mp make_pair
using namespace std;

int n;

int main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  cin >> n;
  if(n % 2 == 1){
    cout << 7;
    n -= 3;
  } //bebek
  for(int i = n; i > 0; i -= 2){
    cout << 1;
  } cout << '\n';
}