import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int N = 15;
        int[] pos = new int[N];
        int n = scanner.nextInt();
        scanner.nextLine(); // consume the newline character after n

        while (scanner.hasNext()) {
            String x = scanner.next();
            if (x.equals("add")) {
                int y = scanner.nextInt();
                pos[0]++;
            } else if (x.equals("sync")) {
                int y = scanner.nextInt();
                pos[y]++;
                pos[y] = Math.min(pos[y], pos[0]);
            } else if (x.equals("query")) {
                int ans = Integer.MAX_VALUE;
                for (int j = 0; j < n; j++) ans = Math.min(ans, pos[j]);
                System.out.println(ans);
            }
        }
        scanner.close();
    }
}