3 11.11

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Optional;

import static java.lang.System.out;

public final class Main {

    private static final int SIZE = 1000;

    public static final void main(final String[] args) throws IOException {
        try (final var reader = new BufferedReader(new InputStreamReader(System.in))) {
            final var nums = new int[SIZE];

            for (int i = 0; i < SIZE; i++)
                nums[i] = Integer.parseInt(reader.readLine().trim().replace(",", "."));

            final var dp = new int[SIZE];

            for (int i = 0; i < SIZE; i++) {
                dp[i] = 1;

                for (int j = 0; j < i; j++)
                    if (nums[j] < nums[i])
                        dp[i] = Math.max(dp[i], 1 + dp[j]);
            }

            out.println(Arrays.stream(dp).max().getAsInt());
        }
    }
}