#include <stdio.h>

int main(void){
	int i,n;
	int one, seven=0;
	scanf("%d", &n);
	
	one = n/2;
	if(n%2 != 0){
		one -= 1;
		seven = 1;
	}
	
	for(i=0;i<seven;i++){
		printf("7");
	}
	
	for(i=0;i<one;i++){
		printf("1");
	}
	printf("\n");
	return 0;
}