#include <fstream>
#include <vector>
#include <queue>

using namespace std;

struct GraphFlow {
    vector<vector<int>> graph;
    vector<vector<int>> capacity;
    vector<vector<int>> flow;

    GraphFlow(const vector<vector<int>> &graph, const vector<vector<int>> &capacity, const vector<vector<int>> &flow)
            : graph(graph), capacity(capacity), flow(flow) {}
};

GraphFlow readGraph(const string & inputPath)
{
    int n, m;
    ifstream fin(inputPath);
    fin >> n >> m;
    int x, y, c;
    vector<vector<int>> graph(n);
    vector<vector<int>> capacity(n, vector<int>(n, 0));
    vector<vector<int>> flow(n, vector<int>(n, 0));
    for (int i = 0; i < m; i++)
    {
        fin >> x >> y >> c;
        x--; y--;
        graph[x].push_back(y);
        capacity[x][y] += c;

        graph[y].push_back(x);
    }
    fin.close();
    return GraphFlow(graph, capacity, flow);
}

void writeFlow(const string& outputPath, int flow)
{
    ofstream fout (outputPath);
    fout << flow;
    fout.close();
}

vector<int> getDestinationInboundNodes(const vector<vector<int>> &graph, int destination)
{
    vector<int> inboundNodes;
    for (int i = 0; i < graph.size(); i++)
        for (int j = 0; j < graph[i].size(); j++)
            if (graph[i][j] == destination)
                inboundNodes.push_back(i);
    return inboundNodes;
}

void bfsTree(const vector<vector<int>> &graph, const vector<vector<int>> &capacity, const vector<vector<int>> &flow,
        vector<int> & parent, int source)
{
    fill(parent.begin(), parent.end(), -1);
    queue<int> q;
    q.push(source);
    int x;
    parent[source] = source;
    while (!q.empty())
    {
        x = q.front();
        q.pop();
        for (auto y : graph[x])
        {
            if (parent[y] == -1 && (capacity[x][y] - flow[x][y] > 0))
            {
                parent[y] = x;
                q.push(y);
            }
        }
    }
    parent[source] = -1;
}

int computeMaxFlow(const GraphFlow& graphFlow, int source, int destination)
{
    vector<vector<int>> graph = graphFlow.graph;
    vector<vector<int>> capacity = graphFlow.capacity;
    vector<vector<int>> flow = graphFlow.flow;
    vector<int> parent(graph.size());
    bfsTree(graph, capacity, flow, parent, source);
    vector<int> destinationInNodes = getDestinationInboundNodes(graph, destination);
    int totalFlow = 0;
    int minFlow;
    int srcNode, tarNode;
    while (parent[destination] >= 0)
    {
        for (auto x: destinationInNodes)
            if (parent[x] >= 0 && (capacity[x][destination] - flow[x][destination] > 0))
            {
                minFlow = capacity[x][destination] - flow[x][destination];
                srcNode = x;
                tarNode = destination;
                while (srcNode != -1)
                {
                    minFlow = min(minFlow, capacity[srcNode][tarNode] - flow[srcNode][tarNode]);
                    tarNode = srcNode;
                    srcNode = parent[tarNode];
                }

                if (minFlow <= 0)
                    continue;

                totalFlow += minFlow;
                srcNode = x;
                tarNode = destination;
                while (srcNode != -1)
                {
                    flow[srcNode][tarNode] += minFlow;

                    flow[tarNode][srcNode] -= minFlow;

                    tarNode = srcNode;
                    srcNode = parent[tarNode];
                }
            }
        bfsTree(graph, capacity, flow, parent, source);
    }

    return totalFlow;
}

int main()
{
    auto graphFlow = readGraph("maxflow.in");
    writeFlow("maxflow.out", computeMaxFlow(graphFlow, 0, graphFlow.graph.size() - 1));
    return 0;
}