import java.util.*;
public class ex17 {
public static void main(String []args)
{
Scanner in = new Scanner(System.in);
int num = 0;
int counter = 0;
while(num != -1)
{
System.out.println("Enter number between 0-9 and enter -1 to finish");
int newnum = in.nextInt();
if(num == newnum-1)
{
counter++;
}
num = newnum;
}
System.out.println(counter);
}
}
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