import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int n=5;
int res=0;
while(n-->0) {
int date=sc.nextInt();
if((date/1000==date%100/10)&&(date%10-1==date/100%10)) {
res++;
}
}
System.out.println(res);
}
}
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