#include <iostream>
using namespace std;

int main() {
    // your code goes here
    
    int a;
    int one;
    cin >> a;
    
    if (a > 3){
    	/* code */
    	    one = a/2;
    
		for(int i = 0; i < one; i++ ){
		    cout << "1";
		}

    }else if (a == 3){
    	/* code */
    	cout << "7";
    }else if(a == 1){
    	cout << "1";
    }

    cout << endl;
    
    return 0;
}