#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
#include <cstring>
using namespace std;
ifstream fin("maxflow.in");
ofstream fout("maxflow.out");

const int Nmax = 1005;
const int oo = (1<<30);
vector <int> G[Nmax];

int N,M,destFlow;
int maxFlow[Nmax][Nmax],currentFlow[Nmax][Nmax],Use[Nmax],TT[Nmax],Q[Nmax];

int BFS()
{
    memset(Use,0,sizeof(Use));
    Q[0]=Q[1]=1;
    Use[1]=1;

    for(int j=1;j<=Q[0];j++)
    {
        int Nod=Q[j];

        if(Nod==N)
            continue;

        for(int i=0;i<G[Nod].size();i++)
        {
            int Vecin=G[Nod][i];

            if(maxFlow[Nod][Vecin] == currentFlow[Nod][Vecin] || Use[Vecin] )
                continue;

            Use[Vecin]=1;
            TT[Vecin]=Nod;
            Q[++Q[0]]=Vecin;
        }
    }
    return Use[N];
}

void read()
{
    fin>>N>>M;
    for(int i=1;i<=M;i++)
    {
        int x,y,f;
        fin>>x>>y>>f;
        maxFlow[x][y]+=f;
        G[x].push_back(y);
        G[y].push_back(x);
    }
}

int main()
{
    read();
    for( destFlow = 0; BFS() ; )
    {
        for(int i=0;i<G[N].size();i++)
        {
            int Nod=G[N][i];

            if(maxFlow[Nod][N]==currentFlow[Nod][N] || !Use[Nod])
                continue;

            TT[N]=Nod;

            int maxAddFlow=oo;
            for(int nod = N ; nod != 1 ; nod = TT[nod])
                maxAddFlow = min(maxAddFlow , maxFlow[ TT[nod] ][nod] - currentFlow[ TT[nod] ][nod]);

            if(maxAddFlow == 0)
                continue;

            for(int nod = N ; nod >0 ; nod = TT[nod])
            {
                currentFlow[TT[nod]][nod]+=maxAddFlow;
                currentFlow[nod][TT[nod]]-=maxAddFlow;
            }

            destFlow+=maxAddFlow;
        }
    }
    fout<<destFlow<<"\n";
    return 0;
}