import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static HashMap<Integer, ArrayList<Integer>> graph = new HashMap<>();
    static HashMap<Integer, Integer> visited = new HashMap<>();
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        for (int i = 0; i < m; i++) {
            int left = sc.nextInt();
            int right = sc.nextInt();
            if (!graph.containsKey(left)) {
                graph.put(left, new ArrayList<>());
            }
            graph.get(left).add(right);
        }
        long ans = (n + 1L) * n / 2;
        for (int x : graph.keySet()) {
            int value = getValue(x, new HashSet<>());
            ans += value - x;
        }
        System.out.println(ans);
    }
    
    static int getValue(int x, HashSet<Integer> used) {
        if (used.contains(x)) {
            return 0;
        }
        if (!visited.containsKey(x)) {
            used.add(x);
            int value = x;
            if (graph.containsKey(x)) {
                for (int y : graph.get(x)) {
                    value = Math.max(value, getValue(y, used));
                }
            }
            visited.put(x, value);
            used.remove(x);
        }
        return visited.get(x);
    }
    
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}