#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;
};