#include <bits/stdc++.h>
using namespace std;
int pd(string n)
{
    if (n[0] == n[2] && n[1] + 1 == n[3])
    {
        return 1;
    }
    return 0;
}
int main()
{
    string a,b,c,d,e;
    cin>>a;
    cin>>b;
    cin>>c;
    cin>>d;
    cin>>e;
    int sum = pd(a) + pd(b) + pd(c) + pd(d) + pd(e);
    cout<<sum<<endl;
    return 0;
}