#include <stdio.h>

void main(void){
	int matchstick = 0;
	int input = scanf("%d\n",&matchstick);
	if(matchstick  == 3){
		printf("%d",7);
	}else if(matchstick%2 == 0){
		int numCount = matchstick/2;
		for(int i = 0;i < numCount ; i++){
			printf("%d",1);
		}
	}
}