#include <fstream>
#include <queue>

using namespace std;

#define N 1005
#define M 5005
#define INF 2147483647

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

int n, m, s, d;
int c[N][N], f[N][N];
int t[N];
int flux = 0;

int lst[N], vf[2 * M], urm[2 * M], nvf = 0;

queue<int> q;

inline bool bf()
{
    bool ok = 0;
    for(int i = 1; i <= n; i++)
        t[i] = 0;

    q.push(s);

    while(!q.empty())
    {
        int x = q.front();
        q.pop();

        for(int i = lst[x]; i; i = urm[i])
        {
            int y = vf[i];

            if(!t[y] && c[x][y] > f[x][y])
            {
                if(y != d)
                {
                    t[y] = x;
                    q.push(y);
                }
                else
                    ok = 1;
            }
        }
    }

    return ok;
}

int main()
{
    in >> n >> m;
    s = 1;
    d = n;

    for(int i = 1; i <= m; i++)
    {
        int x, y;
        in >> x >> y;
        in >> c[x][y];

        vf[++nvf] = y;
        urm[nvf] = lst[x];
        lst[x] = nvf;
        vf[++nvf] = x;
        urm[nvf] = lst[y];
        lst[y] = nvf;
    }

    for(; bf();)
    {
        for(int i = lst[d]; i; i = urm[i])
        {
            int y = vf[i];

            if(t[y] && c[y][d] > f[y][d])
            {
                t[d] = y;
                int minim = INF;

                for(int x = d; x != s; x = t[x])
                    if(minim > c[t[x]][x] - f[t[x]][x])
                        minim = c[t[x]][x] - f[t[x]][x];

                if(minim <= 0)
                    continue;

                flux += minim;

                for(int x = d; x != s; x = t[x])
                {
                    f[t[x]][x] += minim;
                    f[x][t[x]] -= minim;
                }
            }
        }
    }

    out << flux << '\n';
}