JS 100제 문제 75 이상한 369

<풀이 코드>

	const n = prompt();
	
	var arr = "";
	
	for(var i=1;i<=n;i++){
			arr += i+",";
	}
	var r = arr.split(",");
	var count = 0;
	
	for(var i in r){
		if(r[i].includes(3)||r[i].includes(6)||r[i].includes(9)){
			count++;
			if(r[i].includes(0)||r[i].includes(1)||r[i].includes(2)||r[i].includes(4)||r[i].includes(5)||r[i].includes(7)||r[i].includes(8)){
				count--;
			}					
		}
	}
	
	console.log(count);