#include<fstream>
#include<vector>
#include<queue>
#include<algorithm>
using namespace std;


ifstream in("maxflow.in");
ofstream out("maxflow.out");

vector<int> G[1001];
deque<int> q;
int N, M,a,b,c,i,T=0;
int viz[1001];
int from[1001],min_val[1001],O[1001],A[1001][1001];
int BFS(int x)
{
	q.push_back(x);
	viz[x] = T+1;
	min_val[1] = 1 << 30;
	int i;
	while (q.size())
	{
		x = q.front();
		q.pop_front();
		for (i = 0; i < G[x].size();++i)
			if (viz[G[x][i]]<=T && A[x][G[x][i]]>0)
			{
				q.push_back(G[x][i]);
				viz[G[x][i]] = T+1;
				from[G[x][i]] = x;
				min_val[G[x][i]] = min(min_val[x], A[x][G[x][i]]);
				if (G[x][i] == N)
				{
					q.clear();
					return 1;
				}
			}
	}
	return 0;
}
void update(int x)
{
	int min_value = min_val[x];
	while (from[x])
	{
		if (A[from[x]][x] - min_value >= 0)
		{
			A[from[x]][x] = A[from[x]][x] - min_value;
			A[x][from[x]] = A[x][from[x]] + min_value;
		}
		else
		{
			A[from[x]][x] = A[from[x]][x] + min_value;
			A[x][from[x]] = A[x][from[x]] - min_value;
		}
		x = from[x];
	}
}
void Edmond()
{
	while (BFS(1))
	{
		update(N);
		++T;
	}
}



int main()
{
	in >> N >> M;
	for (i = 1; i <= M; ++i)
	{
		in >> a >> b>>c;
		G[a].push_back(b);
		A[a][b] = c;
		G[b].push_back(a);
	}
	for (i = 0; i < G[1].size(); ++i)
		O[i] = A[1][G[1][i]];
	Edmond();
	int s = 0;
	for (i = 0; i < G[1].size(); ++i)
		s += O[i]-A[1][G[1][i]];
	out << s;
	return 0;
}