#include<iostream>



using namespace std;


int main(){
	int N;
	cin >> N;
	int count;

	if(N < 3){
		cout << "1" << endl;
	}
	else if(N < 4){
		cout << "7" << endl;
	}

	else
	{
		if(N % 2 == 0){
			count = N/2;
		}
		else
		{
			count = (N-3)/2;
			cout << "7";
		}
		for(int i=0;i<count;i++){
			cout << "1";
		}
		cout << endl;

	}
	return 0;
}