import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;

public class SolutionIvan {
    public static void main(String[] args) throws Exception {
        new SolutionIvan().run();
    }

    int n = 1;
    List<List<Integer>> g = new ArrayList<>();
    List<Map<String, Integer>> nodes = new ArrayList<>();
    List<Integer> weights = new ArrayList<>();
    List<Integer> totalD = new ArrayList<>();
    List<Integer> totalC = new ArrayList<>();

    void fillTotal(int v) {
        if (g.get(v).isEmpty()) {
            totalD.set(v, 0);
            totalC.set(v, weights.get(v));
            return;
        }

        int td = 0;
        int tc = weights.get(v);
        for (int u : g.get(v)) {
            fillTotal(u);
            td += totalD.get(u) + totalC.get(u);
            tc += totalC.get(u);
        }
        totalD.set(v, td);
        totalC.set(v, tc);
    }

    long ans = Long.MAX_VALUE;
    void solve(int v, long up, long upc) {
        ans = Math.min(ans, up + totalD.get(v));

        for (int u : g.get(v)) {
            long cExceptU = totalC.get(v) - totalC.get(u);
            long newUpc = upc + cExceptU;
            long newUp = up + upc + totalD.get(v) - totalD.get(u) - totalC.get(u) + cExceptU;
            if (!nodes.get(u).isEmpty())
                solve(u, newUp, newUpc);
        }
    }
    void run() throws Exception {
        Scanner scanner = new Scanner(System.in);

        nodes.add(new HashMap<>());
        weights.add(0);

        int lineCount = scanner.nextInt();
        scanner.nextLine();
        for (int i = 0; i < lineCount; ++i) {
            int current = 0;
            String line = scanner.nextLine().strip().substring(1);
            StringTokenizer tokens = new StringTokenizer(line, "/");
            while (tokens.hasMoreTokens()) {
                String token = tokens.nextToken();
                current = nodes.get(current).computeIfAbsent(token, missingToken -> {
                    nodes.add(new HashMap<>());
                    weights.add(0);
                    return n++;
                });
            }
            weights.set(current, weights.get(current) + 1);
        }

        for (int i = 0; i < n; ++i) {
            g.add(new ArrayList<>(nodes.get(i).values()));
            totalD.add(0);
            totalC.add(0);
        }

        fillTotal(0);

        solve(0, 0, 0);
        System.out.println(ans);
    }
}