using System;
using System.Linq;
using System.Collections.Generic;
using Debug = System.Diagnostics.Debug;
using SB = System.Text.StringBuilder;
using System.Numerics;
using static System.Math;
using Point = System.Numerics.Complex;
using Number = System.Int64;

namespace Program {
    public class Solver {
        Random rnd = new Random(0);
        public void Solve() {
            var n = ri;
            var m = ri;
            var f = new int[m];
            var t = new int[m];
            var deg = new int[n];
            var outdeg = new int[n];
            for (int i = 0; i < m; i++)
            {
                f[i] = ri - 1;
                t[i] = ri - 1;
                deg[f[i]]++; deg[t[i]]++;
                outdeg[f[i]]++;
            }
            bool[] isCycle = pre(n, f, t);
            var set = new DisjointSet(n);
            for (int i = 0; i < m; i++)
                if (isCycle[f[i]] && isCycle[t[i]]) set.Unite(f[i], t[i]);
            var T = Enumerate(n, x => new List<int>());
            for (int i = 0; i < m; i++)
                if (set[f[i]] != set[t[i]])
                    T[set[t[i]]].Add(set[f[i]]);

            const long M = (long)1e9 + 7;
            Func<int, int, long> dfs = null;
            dfs = (pre, cur) =>
            {
                //Debug.WriteLine($"{pre} {cur}");
                var v = 1L;
                foreach (var to in T[cur]) v = v * dfs(cur, to) % M;
                return (v + 1) % M;
            };
            var ans = 1L;
            for (int i = 0; i < n; i++)
            {
                //cycle
                if (set[i] == i && isCycle[i]) ans = ans * dfs(-1, i) % M;
                //isolated vertex
                if (deg[i] == 0) ans = ans * 2 % M;
                //end point
                if (T[i].Count != 0 && outdeg[i] == 0) ans = ans * dfs(-1, i) % M;


            }
            Console.WriteLine(ans);
        }

        bool[] pre(int n, int[] f, int[] t) {
            var g = Enumerate(n, x => new List<int>());
            var ret = Enumerate(n, x => true);
            var indeg = new int[n];
            for (int i = 0; i < f.Length; i++)
            {
                g[f[i]].Add(t[i]);
                indeg[t[i]]++;
            }
            var q = new Queue<int>();
            for (int i = 0; i < n; i++)
                if (indeg[i] == 0) q.Enqueue(i);
            while (q.Any())
            {
                var p = q.Dequeue();
                ret[p] = false;
                foreach (var to in g[p])
                {
                    indeg[to]--;
                    if (indeg[to] == 0) q.Enqueue(to);
                }
            }

            return ret;
        }

        const long INF = 1L << 60;
        int ri { get { return sc.Integer(); } }
        long rl { get { return sc.Long(); } }
        double rd { get { return sc.Double(); } }
        string rs { get { return sc.Scan(); } }
        public IO.StreamScanner sc = new IO.StreamScanner(Console.OpenStandardInput());

        static T[] Enumerate<T>(int n, Func<int, T> f) {
            var a = new T[n];
            for (int i = 0; i < n; ++i) a[i] = f(i);
            return a;
        }
        static public void Swap<T>(ref T a, ref T b) { var tmp = a; a = b; b = tmp; }
    }
}

#region main
static class Ex {
    static public string AsString(this IEnumerable<char> ie) { return new string(ie.ToArray()); }
    static public string AsJoinedString<T>(this IEnumerable<T> ie, string st = " ") {
        return string.Join(st, ie);
    }
    static public void Main() {
        Console.SetOut(new Program.IO.Printer(Console.OpenStandardOutput()) { AutoFlush = false });
        var solver = new Program.Solver();
        solver.Solve();
        Console.Out.Flush();
    }
}
#endregion
#region Ex
namespace Program.IO {
    using System.IO;
    using System.Text;
    using System.Globalization;

    public class Printer: StreamWriter {
        public override IFormatProvider FormatProvider { get { return CultureInfo.InvariantCulture; } }
        public Printer(Stream stream) : base(stream, new UTF8Encoding(false, true)) { }
    }

    public class StreamScanner {
        public StreamScanner(Stream stream) { str = stream; }

        public readonly Stream str;
        private readonly byte[] buf = new byte[1024];
        private int len, ptr;
        public bool isEof = false;
        public bool IsEndOfStream { get { return isEof; } }

        private byte read() {
            if (isEof) return 0;
            if (ptr >= len)
            {
                ptr = 0;
                if ((len = str.Read(buf, 0, 1024)) <= 0)
                {
                    isEof = true;
                    return 0;
                }
            }
            return buf[ptr++];
        }

        public char Char() {
            byte b = 0;
            do b = read(); while ((b < 33 || 126 < b) && !isEof);
            return (char)b;
        }
        public string Scan() {
            var sb = new StringBuilder();
            for (var b = Char(); b >= 33 && b <= 126; b = (char)read()) sb.Append(b);
            return sb.ToString();
        }
        public string ScanLine() {
            var sb = new StringBuilder();
            for (var b = Char(); b != '\n' && b != 0; b = (char)read()) if (b != '\r') sb.Append(b);
            return sb.ToString();
        }
        public long Long() { return isEof ? long.MinValue : long.Parse(Scan()); }
        public int Integer() { return isEof ? int.MinValue : int.Parse(Scan()); }
        public double Double() { return isEof ? double.NaN : double.Parse(Scan(), CultureInfo.InvariantCulture); }
    }
}

#endregion


class DisjointSet {
    int[] par;
    public DisjointSet(int n) {
        par = new int[n];
        for (int i = 0; i < n; i++)
            par[i] = i;
    }
    public void Unite(int i, int j) {
        i = this[i];
        j = this[j];
        par[j] = i;

    }
    public int this[int index] {
        get {
            if (index == par[index]) return index;
            else return par[index] = this[par[index]];
        }
    }
}


Measured memory_bytes: 20572