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Q1065.java
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Q1065.java
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package forRank;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class Q1065 {
private static boolean isSequence(int number){
if(number < 10)
return true;
int dist = (number % 100) / 10 - number % 10;
while(number >= 10){
int front = (number % 100) / 10;
int end = number % 10;
if(front - end != dist)
return false;
number /= 10;
}
return true;
}
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
int n = Integer.parseInt(br.readLine());
int counter = 0;
for (int i = 1; i <= n; i++) {
if(isSequence(i))
counter++;
}
bw.write(counter + "\n");
br.close();
bw.close();
}
}