#include <iostream>
#include <vector>
using namespace std;
# define M_PI 3.14159265358979323846

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
	
	int n;
    cin >> n;
	
	vector<char> output;
	
	int tmp = n / 2; 
	if(n % 2 == 0) {
		for(int i = 0; i < tmp; i++){
			output.push_back('1');
		}
	} else {
		int tmp = n / 2 - 1;
		for(int i = 0; i < tmp; i++){
			output.push_back('1');
		}
		output.push_back('7');
	}
	
	for(auto x:output){
		cout << x;
	}
	cout << endl;
	
	return 0;
}