#include <bits/stdc++.h>
#define NMAX 1005
#define INF 0x3f3f3f3f
using namespace std;
ifstream fin ("maxflow.in");
ofstream fout ("maxflow.out");
void read();
int s, t;
int n, m, flow;
bool viz[NMAX];
vector<int> v[NMAX];
int c[NMAX][NMAX], f[NMAX][NMAX];
int p[NMAX];
int bfs()
{
    for(int i=1; i<=n; i++)
        p[i] = 0;
    queue<int> q;
    p[s] = s;
    q.push(s);
    while(!q.empty())
    {
        int nod = q.front();
        q.pop();
        for(auto it:v[nod])
            if(!p[it] && c[nod][it] - f[nod][it] > 0)
            {
                p[it] = nod;
                if(it!=t)
                    q.push(it);
            }
    }
    if(p[t])
        return 1;
    return 0;
}
int main()
{
    read();
    while(bfs())
    {
        int flow_path;
        for(auto it:v[t])
            if(c[it][t] - f[it][t] > 0 && p[it])
            {
                p[t] = it;
                flow_path = INF;
                for(int nod=t; nod!=s; nod=p[nod])
                    flow_path = min(flow_path, c[p[nod]][nod] - f[p[nod]][nod]);
                if(flow_path)
                    for(int nod=t; nod!=s; nod=p[nod])
                    {
                        f[p[nod]][nod]+=flow_path;
                        f[nod][p[nod]]-=flow_path;
                    }
                flow+=flow_path;
            }
    }
    fout << flow;
    return 0;
}
void read()
{
    fin >> n >> m;
    s = 1;
    t = n;
    for(int i=1; i<=m; i++)
    {
        int x, y, cap;
        fin >> x >> y >> cap;
        v[x].push_back(y);
        v[y].push_back(x);
        c[x][y] = cap;
    }
}