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

using namespace std;
ifstream fin("t.in");
ofstream fout("t.out");

#define NMAX 1005
#define INF (1<<30)
vector<int>G[NMAX];
int F[NMAX][NMAX], C[NMAX][NMAX], TT[NMAX], viz[NMAX];
int n, m;
queue<int>Q;

int bfs() {
	int nc;
	memset(viz, 0, sizeof(viz));
	Q.push(1);
	viz[1] = 1;
	for (; !Q.empty(); Q.pop()) {
		nc = Q.front();
		if (nc == n) continue;
		for (int nu : G[nc]) {
			if (!viz[nu] && F[nc][nu] < C[nc][nu]) {
				viz[nu] = 1;
				Q.push(nu);
				TT[nu] = nc;
			}
		}
	}
	return viz[n];
}

int main() {
	int i, x, y, z, flow=0, MIN, nc;
	fin >> n >> m;
	for (i = 0; i < m; i++) {
		fin >> x >> y >> z;
		G[x].push_back(y);
		G[y].push_back(x);
		C[x][y] = z;
	}
	while (bfs()) {
		for (int np : G[n]) {
			if (!viz[np] || F[np][n] == C[np][n]) continue;
			TT[n] = np;
			MIN = INF;
			for (nc = n; nc != 1; nc = TT[nc])
				MIN = min(MIN, C[TT[nc]][nc] - F[TT[nc]][nc]);
			if (MIN == 0) continue;

			for (nc = n; nc != 1; nc = TT[nc]) {
				F[TT[nc]][nc] += MIN;
				F[nc][TT[nc]] -= MIN;
			}
			flow += MIN;
		}
	}
	fout << flow;
}