#include <cstdio>
#include <vector>
#include <algorithm>
#include <queue>
#include <cstring>

#define x first
#define y second
#define NMAX 1007
#define INF 100000000

using namespace std;

int Cap[NMAX][NMAX], Flux[NMAX][NMAX], q[NMAX], dad[NMAX];
int n, Maxflow, m;
vector <int> v[NMAX];

void bfs(){
    int start = 0, avans = 0;
    q[avans++] = 1;
    dad[1] = -2;
    while(avans > start && dad[n] == -1){
        int Nod = q[start++];
        for(int i = 0; i < v[Nod].size() && dad[n] == -1; ++ i)
            if(dad[v[Nod][i]] == -1 && Cap[Nod][v[Nod][i]] > Flux[Nod][v[Nod][i]]){
                q[avans++] = v[Nod][i];
                dad[v[Nod][i]] = Nod;
            }
    }
}

inline int fluxmax(){
    while(1){
        memset(dad, -1, sizeof(dad));
        bfs();
        if(dad[n] == -1)
            return Maxflow;
        for(int i = 1; i <= n; ++ i)
            if(Cap[i][n] && dad[i] != -1){
                int Min = Cap[i][n] - Flux[i][n];
                for (int v = i, u = dad[v]; u > 0; v = u, u = dad[v])
                   Min = min(Min, Cap[u][v] - Flux[u][v]);
                if(! Min)
                    continue;
                Maxflow += Min;
                for (int v = i, u = dad[v]; u > 0; v = u, u = dad[v]){
                    Flux[v][u] -= Min;
                    Flux[u][v] += Min;
                }
            }
    }
    return Maxflow;
}

int main(){
    freopen("maxflow.in", "r", stdin);
    freopen("maxflow.out", "w", stdout);
    scanf("%d %d", &n, &m);
    for(int i = 1; i <= m; ++i){
        int a = 0, b = 0, c = 0;
        scanf("%d %d %d", &a, &b, &c);
        if(a != b){
        v[a].push_back(b);
        v[b].push_back(a);
        Cap[a][b] += c;
        Flux[a][b] = 0;
        }
    }
    printf("%d", fluxmax());
    return 0;
}