180126_1065_한수

//https://www.acmicpc.net/problem/1065 #include <iostream>

using namespace std;

int main()

{

int n,cnt;

cin >> n;

cnt=n;

for(int i=1; i<=n; i++)

{

int now=i;

int diff=now%10-(now%100)/10;

while(now/10>0)

{

if(now%10-(now%100)/10 != diff) {cnt--; break;}

now/=10;

}

/*********

while(now>0)

{

if(now%10-(now%100)/10 != diff) {cnt--; break;}

now/=10;

if(now<10) break;

}

*************/

}

cout << cnt;

}