#include <fstream>
#include <vector>
#include <cstring>
#define x first
#define y second
#define mp make_pair
using namespace std;
ifstream fin("maxflow.in");
ofstream fout("maxflow.out");
int i,j,n,m,p[1005],a,b,c[1001][1001],nod,ok,mini,flow;
vector <int > v[1005];
void add(int nod)
{
    if(p[nod]>0)
    {
        mini = min(mini, c[ p[nod] ][nod]);
        add(p[nod]);
        c[ p[nod] ][nod] -= mini;
        c[nod][ p[nod] ] += mini;
    }

}
void dfs(int nod)
{
    int i;
    for(i = 0; i < v[nod].size(); i++)
    {
        int nxt = v[nod][i];
        if(c[nod][nxt] && p[nxt] == 0)
        {
            p[nxt] = nod;
            if(nxt == n)
            {
                ok = 1;
                mini = c[nod][nxt];
                add(nod);
                flow += mini;
            }
            dfs(nxt);
            if(ok)
                return;
        }
    }
}
int main()
{
    fin >> n >> m;
    for(i = 1; i <= n; i++)
    {
        fin >> a >> b >> j;
        v[a].push_back(b);
        v[b].push_back(a);
        c[a][b] = j;
    }
    ok = 1;
    while(ok)
    {
        ok = 0;
        p[1] = -1;
        dfs(1);
        memset(p,0,sizeof(p));
    }
    fout<<flow;

return 0;
}