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

const int MAX_N = 1e3;
const int INF = 2e9;

std::vector<int> G[2 + MAX_N];

int r[2 + MAX_N][2 + MAX_N];
int parent[2 + MAX_N];

bool visited[2 + MAX_N];

bool bfs(int n, int u) {
  std::queue<int> q;
  q.push(u);
  visited[u] = true;
  while (!q.empty() && !visited[n]) {
    int u = q.front();
    q.pop();
    for (int v : G[u])
      if (!visited[v] && r[u][v] > 0) {
        visited[v] = true;
        parent[v] = u;
        q.push(v);
      }
  }
  return visited[n];
}

int main() {
  freopen("maxflow.in", "r", stdin);
  freopen("maxflow.out", "w", stdout);
  int n, m;
  scanf("%d%d", &n, &m);
  for (int i = 1; i <= m; i++) {
    int u, v, flow;
    scanf("%d%d%d", &u, &v, &flow);
    G[u].push_back(v);
    G[v].push_back(u);
    r[u][v] = flow;
  }
  int maxFlow = 0;
  while (bfs(n, 1)) {
    for (int u : G[n])
      if (visited[u]) {
        parent[n] = u;
        int flow = INF;
        int v = n;
        while (v != 1) {
          flow = std::min(flow, r[parent[v]][v]);
          v = parent[v];
        }
        v = n;
        while (v != 1) {
          r[parent[v]][v] -= flow;
          r[v][parent[v]] += flow;
          v = parent[v];
        }
        maxFlow += flow;
      }
    for (int i = 1; i <= n; i++)
      visited[i] = false;
  }
  printf("%d", maxFlow);
  return 0;
}