#include <iostream>
using namespace std;

int main() {
	int a,b,i;
	cin >> a;
	if(a==0 || a==1){cout << "0" << endl;}
	else if(1==a%2){b=7;
		for(i=3;i<a;i=i+2){
			b=10*b+1;
		}
		cout << b << endl;
	}
	else if(0==a%2){b=1;
		for(i=2;i<a;i=i+2){
			b=10*b+1;
		}
		cout << b << endl;
	}
	return 0;
}