#include <fstream>
#include <vector>
#include <queue>
#include <cstring>
#define INF 0x3f3f3f3f
#define Nmax 1005
using namespace std;
ifstream fin("maxflow.in");
ofstream fout("maxflow.out");
int n,m,f[Nmax][Nmax],c[Nmax][Nmax],min1,flux,ap[Nmax],venire[Nmax];
vector <int> G[Nmax];
int BFS()
{
    memset(ap,0,sizeof ap);
    queue <int> q;
    q.push(1);
    ap[1]=1;
    while (!q.empty())
    {
        int x=q.front();
        q.pop();
        if (x==n) continue;
        for (auto i:G[x])
        {
            if (c[x][i]!=f[x][i] && !ap[i])
            {
                ap[i]=1;
                q.push(i);
                venire[i]=x;
            }
        }
    }
    return 0;
}
int main()
{
    int i,a,b,y;
    fin>>n>>m;
    for (i=1; i<=m; i++)
    {
        fin>>a>>b>>y;
        G[a].push_back(b);
        G[b].push_back(a);
        c[a][b]+=y;
    }
    while (BFS())
    {
        for (auto nod:G[n])
        {
            if (c[nod][n]!=f[nod][n] && ap[nod])
            {
                venire[n]=nod;
                min1=INF;
                i=n;
                while (i!=1)
                {
                    min1=min(min1,c[venire[i]][i]-f[venire[i]][i]);
                    i=venire[i];
                }
                if (min1!=0)
                {
                    i=n;
                    while (i!=1)
                    {
                        f[venire[i]][i]+=min1;
                        f[i][venire[i]]-=min1;
                        i=venire[i];
                    }
                    flux+=min1;
                }

            }
        }
    }
    fout<<flux;
    return 0;
}