#include <bits/stdc++.h>
using namespace std;
ifstream fin("maxflow.in");
ofstream fout("maxflow.out");
int n,m,i,j;
vector<int> g[1005];
int c[1005][1005],f[1005][1005];
bool sel[1005];
int t[1005];
bool bfs(int x, int y)
{
    queue<int> q;
    for(int i=1;i<=n;i++)
    {
        t[i]=-1;
        sel[i]=0;
    }
    sel[x]=1;
    t[x]=0;
    q.push(x);
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        for(auto it:g[nod])
            if(!sel[it]&&c[nod][it]>f[nod][it])
            {
                t[it]=nod;
                sel[it]=1;
                q.push(it);
            }
    }
    return sel[y];
}
int flux_total;
signed main()
{
    fin>>n>>m;
    for(i=1;i<=m;i++)
    {
        int x,y;
        fin>>x>>y;
        fin>>c[x][y];
        g[x].push_back(y);
        g[y].push_back(x);
    }
    while(bfs(1,n))
    {
        for(auto it:g[n])
            if(t[it]!=-1)
            {
                int nod=it;
                int flux_curent=c[nod][n]-f[nod][n];
                while(nod!=1)
                {
                    int tata=t[nod];
                    flux_curent=min(flux_curent,c[tata][nod]-f[tata][nod]);
                    nod=tata;
                }
                flux_total+=flux_curent;
                f[nod][n]+=flux_curent;
                f[n][nod]-=flux_curent;
                nod=it;
                while(nod!=1)
                {
                    int tata=t[nod];
                    f[tata][nod]+=flux_curent;
                    f[nod][tata]-=flux_curent;
                    nod=tata;
                }
            }
    }
    fout<<flux_total<<'\n';
    return 0;
}