#include <cstdio>
#include <vector>
#include <queue>
#define nmax 10005
using namespace std;

vector <int> g[nmax];
queue <int> q;
int cap[nmax][nmax];
int flow[nmax][nmax];
int t[nmax];
int n,m;
int maxflow;

bool bfs() {
    bool found = false;
    memset(t,0,nmax*4);
    t[1] = -1;
    q.push(1);
    while (!q.empty()) {
        int ct = q.front(); q.pop();
        for (vector <int> :: iterator it = g[ct].begin();it != g[ct].end();it++) {
            if (cap[ct][*it] - flow[ct][*it] > 0 && t[*it] == 0) {
                if (*it != n) {
                    q.push(*it);
                    t[*it] = ct;
                } else {
                    found = true;
                }
            }
        }
    }
    return found;
}

int getMin(int x) {
    if (t[x] != -1) {
        int newMin = getMin(t[x]);
        return minim(newMin,cap[t[x]][x] - flow[t[x]][x]);
    }
}

void update(int x,int value) {
    if (t[x] != -1) {
        flow[t[x]][x] += value;
        flow[x][t[x]] -= value;
        update(t[x],value);
    }
}

int main() {
    freopen("maxflow.in","r",stdin);
    froepen("maxflow.out","w",stdout);
    scanf("%d %d",&n,&m);
    for (int i=1;i<=m;i++) {
        int a,b,c;
        scanf("%d %d %d\n",&a,&b,&c);
        g[a].push_back(b);
        g[b].push_back(a);
        cap[a][b] = c;
    }
    while (bfs()) {
        for (vector <int> :: iterator it = g[n].begin(); it != g[n].end();it++) {
            int min = getMin(*it);
            maxflow += min;
            update(*it,min);
        }
    }
    printf("%d\n",maxflow);
    return 0;
}