[ 백준 ] 1065 한수

package test;

import java.util.Scanner;

public class Test2 {

	public static void main(String[] args) {
		Test2 test = new Test2();
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		System.out.println(test.d(n));;
	}
	
	public int d(int n){
		int count = 0;
		for(int i = 1 ; i <= n ; i++){
			if(1<= i && i < 100){
				count ++;
			}else{
				if(i==1000)break;
				int v = i;
				int temp = 0;
				int[] arr = new int[3];
				while(true){
					if(temp==3)break;
					arr[temp] = v%10;
					v = v/10;
					temp++;
				}
				
				if((arr[0] - arr[1]) == (arr[1] - arr[2]) ){
					count++;
				}
			}
		}
		return count;
	}
}