#include <fstream>
#include <vector>
#include <cstring>

using namespace std;

ifstream fin("maxflow.in");
ofstream fout("maxflow.out");

const int nMax = 1000, oo = 2000000000;
vector<int> g[nMax + 5];
int n, m, c[nMax + 5][nMax + 5], f[nMax + 5][nMax + 5], t[nMax + 5], viz[nMax + 5], cd[nMax + 5];

int BF() {
        cd[0] = cd[1] = 1;
        memset(viz, 0, sizeof(viz));
        viz[1] = 1;
        for (int i = 1; i <= cd[0]; i++) {
            int nod = cd[i];
            if (nod == n)
                continue;
            for (auto j : g[nod]) {
                if (c[nod][j] == f[nod][j] || viz[j])
                    continue;
                viz[j] = 1;
                cd[++cd[0]] = j;
                t[j] = nod;
            }
        }
        return viz[n];
}

int main() {
    fin >> n >> m;
    for (int i = 1; i <= m; i++) {
        int x, y, z;
        fin >> x >> y >> z;
        c[x][y] += z;
        g[x].push_back(y);
        g[y].push_back(x);
    }
    int flow, fmin;
    for (flow = 0; BF(); ) {
        for (auto i : g[n]) {
            if (f[i][n] == c[i][n] || viz[i] == 0)
                continue;
            t[n] = i;
            fmin = oo;
            for (int j = n; j != 1; j = t[j])
                fmin = min(fmin, c[t[j]][j] - f[t[j]][j]);
            if (fmin == 0)
                continue;
            for (int j = n; j != 1; j = t[j]) {
                f[t[j]][j] +=fmin;
                f[j][t[j]] -= fmin;
            }
            flow += fmin;
        }
    }
    fout << flow <<'\n';
    return 0;
}