#include<bits/stdc++.h>
#define in f
#define out g
using namespace std;

ifstream f ("maxflow.in");
ofstream g ("maxflow.out");

int const maxsize =  1010;
int const INF = 20000000;

int n, m, viz[maxsize];
int father[maxsize];
vector<int> v[maxsize];
int cp[maxsize][maxsize];
int x, y, z, k = INF;
long long s;

int bfs () {
    queue<int> q;
    q.push(1);
    while (!q.empty()) {
        int node = q.front();
        if (node == n)
            return 1;
        viz[node]++;
        q.pop();
        for (int i = 0; i < v[node].size(); i++) {
            int ngh = v[node][i];
            if (viz[ngh] == 0 && cp[node][ngh] > 0) {
                k = min(k, cp[node][ngh]);
                father[ngh] = node;
                q.push(ngh);
            }
        }
    }
    return 0;
}

int main() {
    in >> n >> m;
    for (int i = 1; i <= m; i++) {
        in >> x >> y >> z;
        cp[x][y] = z;
        v[x].push_back(y);
    }
    while (bfs() == 1) {
        s += k;
        int node = n;
        while (father[node] != 0) {
            cp[father[node]][node] -= k;
            node = father[node];
        }
        for (int i = 1; i <= n; i++)
            viz[i] = 0;
        k = INF;
    }
    out << s;
}