#include <algorithm>
#include <vector>
#include <queue>
using namespace std;

#define pb push_back
#define DIM 1005

int f[DIM][DIM],c[DIM][DIM];
vector <int> g[DIM];
queue <int> q;
int n,m,flow;
int t[DIM];

void read ()
{
    int i,x,y,z;

    scanf ("%d%d",&n,&m);
    for (i=1; i<=m; ++i)
    {
        scanf ("%d%d%d",&x,&y,&z);
        g[x].pb (y);
        g[y].pb (x);
        c[x][y]=z;
    }
}

inline int bf ()
{
    vector <int> :: iterator it;
    int nod;

    memset (t,0,sizeof (t));
    t[1]=-1;
    for (q.push (1); !q.empty (); q.pop ())
    {
        nod=q.front ();
        for (it=g[nod].begin (); it!=g[nod].end (); ++it)
            if (!t[*it] && c[nod][*it]>f[nod][*it])
            {
                t[*it]=nod;
                q.push (*it);
            }
    }
    return t[n];
}

void solve ()
{
    int nrmin,i,j;

    for ( ; bf (); )
        for (i=1; i<=n; ++i)
            if (t[i] && c[i][n]>f[i][n])
            {
                nrmin=c[i][n]-f[i][n];
                for (j=i; j!=1; j=t[j])
                    nrmin=min (nrmin,c[t[j]][j]-f[t[j]][j]);
                f[i][n]+=nrmin;
                f[n][i]-=nrmin;
                for (j=i; j!=1; j=t[j])
                {
                    f[t[j]][j]+=nrmin;
                    f[j][t[j]]-=nrmin;
                }
                flow+=nrmin;
            }
    printf ("%d",flow);
}

int main ()
{
    freopen ("maxflow.in","r",stdin);
    freopen ("maxflow.out","w",stdout);

    read ();
    solve ();

    return 0;
}