#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;

string a;
int main()
{
    int cnt = 0;
    int x = 5;
    while (x -- )
    {
        for (int i = 1; i <= 4; i ++ )
        {
            cin >> a[i];
            if (i == 4) 
            {
            if (a[1] == a[3] && a[2] + 1 == a[4])
                cnt ++ ;
            }
        }
    }
  
    cout << cnt << endl;
    return 0;
};

#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,ans=0;
	for(int i=1;i<=5;i++){
		cin>>x;
		int a,b,c,d;
		a=x%10;
		b=x/10%10;
		c=x/100%10;
		d=x/1000%10;
		if(d==b&&a==c+1){
			ans++;
		}
	}
	cout<<ans;
	return 0;
}