#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main(int argc, char* argv[])
{
    int total = 0;

    string line;
    while(getline(cin, line))
    {
        string::size_type n = line.find(',');
        string half1 = line.substr(0,n);
        string half2 = line.substr(n+1);

        n = half1.find('-');
        int half1_start = stoi(half1.substr(0,n));
        int half1_end = stoi(half1.substr(n+1));

        n = half2.find('-');
        int half2_start = stoi(half2.substr(0,n));
        int half2_end = stoi(half2.substr(n+1));

        if (!(half1_end < half2_start || half2_end < half1_start))
        {
            total++;            
        }
    }
    cout << total << endl;
}