#include <fstream>
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>

using namespace std;

const int NMAX = 1005;

int n;
int c[NMAX][NMAX];

vector <int> graph[NMAX];

class InputReader {
    public:
        InputReader() {}
        InputReader(const char *file_name) {
            input_file = fopen(file_name, "r");
            cursor = 0;
            fread(buffer, SIZE, 1, input_file);
        }
        inline InputReader &operator >>(int &n) {
            while(buffer[cursor] < '0' || buffer[cursor] > '9') {
                advance();
            }
            n = 0;
            while('0' <= buffer[cursor] && buffer[cursor] <= '9') {
                n = n * 10 + buffer[cursor] - '0';
                advance();
            }
            return *this;
        }
    private:
        FILE *input_file;
        static const int SIZE = 1 << 17;
        int cursor;
        char buffer[SIZE];
        inline void advance() {
            ++ cursor;
            if(cursor == SIZE) {
                cursor = 0;
                fread(buffer, SIZE, 1, input_file);
            }
        }
} fin("maxflow.in");
inline void read() {
    int m = 0;
    fin >> n >> m;

    int a, b, cost;
    while (m --) {
        cin >> a >> b >> cost;
        c[a][b] += cost;
    }

    int i, j;
    for (i = 1; i <= n; ++ i)
        for (j = i + 1; j <= n; ++ j)
            if (c[i][j] || c[j][i]) {
                graph[i].push_back(j);
                graph[j].push_back(i);
            }
}

int h[NMAX];
int e[NMAX];

int h_apps[NMAX]; //h_apparences

queue <int> _queue;
bool in_queue[NMAX];

inline void push(int node1, int node2) {
    int to_be_pushed = min(e[node1], c[node1][node2]);

    if (to_be_pushed) {
        e[node1] -= to_be_pushed;
        e[node2] += to_be_pushed;

        c[node1][node2] -= to_be_pushed;
        c[node2][node1] += to_be_pushed;

        if (!in_queue[node2]) {
            _queue.push(node2);
            in_queue[node2] = true;
        }
    }
}

inline void gap(int check_h) {
    if (!h_apps[check_h]) {
        for (int i = 1; i <= n; ++ i)
            if (h[i] > check_h) {
                h[i] = check_h + 1;
                h_apps[h[i]] --;
            }
    }
}

inline void relabel(int node) {
    ++ h[node];
    h_apps[h[node] - 1] --;
    h_apps[h[node]] ++;

    gap(h[node] - 1);
}

int iter[NMAX];
void discharge(int node) {
    while (1) {
        for (int i = 0; i < graph[node].size(); ++ i)
            if (h[node] > h[graph[node][i]]) {
                push(node, graph[node][i]);
                if (!e[node]) {
                    iter[node] = i;
                    return ;
                }
            }

        for (int i = 0; i < iter[node]; ++ i)
            if (h[node] > h[graph[node][i]]) {
                push(node, graph[node][i]);
                if (!e[node]) {
                    iter[node] = i;
                    return ;
                }
            }
        iter[node] = 0;

        relabel(node);
    }
}

int push_relabel_maxflow(int s, int t) {
    _queue.push(s);
    in_queue[s] = true;

    h[s] = n;
    for (auto it: graph[s])
        e[s] += c[s][it];

    int node, steps = 0;
    while (!_queue.empty()) {
        node = _queue.front();
        _queue.pop();
        in_queue[node] = false;

        ++ steps;

        if (node == t || (node == s && steps > 1))
            continue ;

        discharge(node);
    }

    return e[t];
}

int main()
{
    ofstream cout("maxflow.out");

    read();

    cout << push_relabel_maxflow(1, n) << '\n';

    //cin.close();
    cout.close();
    return 0;
}