import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int n = sc.nextInt();
		if (n==2) {System.out.println(1);}
		else if (n==3) {System.out.println(7);}
		else {
			int one = 0;
			int sev = 0;
			if (n%2==0) {
				one = n/2;
				sev = 0;
			}
			else {
				one = n/2-1;
				sev = 1;
			}
			StringBuilder sb = new StringBuilder("");
			for (int i=0; i<sev; i++) {
				sb.append("7");
			}
			for (int i=0; i<one; i++) {
				sb.append("1");
			}
			System.out.println(sb);
		}
	}
}