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

using namespace std;

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

vector<int> v[1001];
queue<int> cd;

int n,m,i,j,a[1001][1001],x,y,c,tt[1001],nod,Min,flux;

int main()
{
    fin>>n>>m;

    for (i=1;i<=n;i++)
        for (j=1;j<=n;j++)
            a[i][j]=-1;

    for (i=1;i<=m;i++)
    {
        fin>>x>>y>>c;
        v[x].push_back(y);
        a[x][y]=c;
        //if (y!=n)
        {
            v[y].push_back(x);
            a[y][x]=0;
        }
    }
    do
    {
        for (i=1;i<=n;i++)
            tt[i]=0;
        cd.push(1);
        while (cd.empty() == false)
        {
            nod = cd.front();
            cd.pop();
            for (vector<int>::iterator it = v[nod].begin(); it != v[nod].end(); it++)
            {
                if (tt[*it]==0&&a[nod][*it]>0)
                {
                    tt[*it]=nod;
                    cd.push(*it);
                }
            }
        }
        nod=n;
        Min=a[tt[nod]][nod];
        while (nod!=1&&tt[nod]!=0)
        {
            Min=min(Min,a[tt[nod]][nod]);
            nod=tt[nod];
        }
        nod=n;a[nod][tt[nod]]-=Min;
        while (nod!=1&&tt[nod]!=0)
        {
            a[tt[nod]][nod]-=Min;
            //if (a[nod][tt[nod]]!=-1)
            a[nod][tt[nod]]+=Min;
            nod=tt[nod];
        }
        //if (nod==1)
        flux+=Min;
    }while (tt[n]!=0);
    fout<<flux;
    return 0;
}