enum Type{
	EVEN,ODD;
}

class Counter{
	int match;
	Type type;
	StringBuilder ans;
	
	public Counter(int i){
		this.match = i;
		if(match%2 == 0)
			this.type = Type.EVEN;
		else
			this.type = Type.ODD;
		ans = new StringBuilder();
	}
	
	public void lineUpOne(){
		for(int i = 0;i < this.match/2;i++){
			this.ans.append('1');
		}
	}
	
	public void changeTheHead(){
		if(this.type.equals(Type.ODD))
			this.ans.setCharAt(0,'7');
	}
}

public class No_83_2{
	public static void main(String[] args){
		java.util.Scanner sc = new java.util.Scanner(System.in);
		
		Counter counter = new Counter(sc.nextInt());
		
		counter.lineUpOne();
		
		counter.changeTheHead();
		
		System.out.println(counter.ans);
		
	}
}