[EAZY] 백준 1065번 한수

#include<iostream>  

using namespace std;

int cal(int in);
int main(void){
	
	int in;
	
	cin >> in;
	
	int a = cal(in);
	
	cout << a << endl;
	
}

int cal(int in)
{
	int ans,in1,in2,in3;
	if(in<100)
		return in;
		
	ans = 99;
	
	for(int i=100;i<=in;++i)
	{
		in1 = i/100;
		in2 = (i-in1*100)/10;
		in3 = i%10;
		
		
		if((in1-in2)==(in2-in3))
			ans++;
	}
	
	return ans;
	
}