#include <iostream>
using namespace std;
int main(int argc, char* argv[])
{
	int N;
	cin>>N;
	if (N==3){
		cout<<7<<endl;
		return 0;
	}
	int n=N/2;
	for (int i=1;i<=n;i++){
		cout<<"1";
	}
	cout<<endl;
	return 0;
}