#include <iostream>
using namespace std;
int main(int argc, char* argv[])
{
	int N;
	cin>>N;
	switch(N){
	case 2:
		cout<<1;
		break;
	case 3:
		cout<<7;
		break;
	case 4:
		cout<<11;
		break;
	default:
		if (N-3>=2){
			cout<<7;
			N-=3;
		}
		while (N>=2){
			cout<<1;
			N-=2;
		}
		break;

	}
	int n=N/2;
	for (int i=1;i<=n;i++){
		cout<<"1";
	}
	cout<<endl;
	return 0;
}