import java.io.*;
import java.util.*;
import java.text.*;

class Solution {
    BufferedReader in;
    PrintStream out;
    void solve() throws Exception
    {
	int lines=0;
	String line;
	while ((line = in.readLine()) != null) {
	    ++lines;
	}
	out.println(lines);
    }
}

public class count {
    public static void main(String[] args) throws Exception {
        Solution solution = new Solution();
        solution.in = new BufferedReader(new InputStreamReader(System.in));
        solution.out = System.out;
        solution.solve();
    }
}