2 11.11

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

import static java.lang.System.out;

public final class Main {

    public static final void main(final String[] args) throws IOException {
        try (final var reader = new BufferedReader(new InputStreamReader(System.in))) {
            final var nums = new double[500];

            for (int i = 0; i < 500; i++)
                nums[i] = Double.parseDouble(reader.readLine().trim().replace(",", "."));

            var ind = 0;
            final var filter = new ArrayList<ArrayList<Double>>(1);

            while (ind < nums.length) {
                final var list = new ArrayList<Double>(1);
                list.add(nums[ind++]);

                while (ind < nums.length && nums[ind - 1] < nums[ind])
                    list.add(nums[ind++]);

                filter.add(list);
            }

            out.println(
                    filter
                            .stream()
                            .map(list -> list.stream().takeWhile(x -> x > 0.0).reduce(Double::sum))
                            .max(Comparator.comparing(Optional::get))
                            .get().get()
            );
        }
    }
}