#include <bits/stdc++.h>
using namespace std;
#define FILE_IO
typedef pair<int, int> pii;
typedef pair<pii, int> p3i;
class EdmondsKarp
{
public:
int N, S, T;
vector <p3i> edges;
int cp[1005][1005];
int flw[1005][1005];
vector <int> edg[1005];
int d[1005], f[1005];
bool initGraph;
EdmondsKarp()
{
N = S = T = 0;
memset(cp, 0, sizeof(cp));
memset(flw, 0, sizeof(flw));
memset(d, 0, sizeof(d));
memset(f, 0, sizeof(f));
initGraph = false;
}
void addEdge(int x, int y, int c)
{
edges.push_back({{x, y}, c});
initGraph = false;
}
void createGraph()
{
memset(cp, 0, sizeof(cp));
N = 0;
for(auto e: edges)
{
N = max(N, max(e.first.first, e.first.second));
cp[e.first.first][e.first.second] += e.second;
}
for(int i = 1; i <= N; i++) edg[i].clear();
for(int i = 1; i <= N; i++)
for(int j = i + 1; j <= N; j++)
if(cp[i][j] || cp[j][i])
{
edg[i].push_back(j);
edg[j].push_back(i);
}
initGraph = true;
}
void BFS(int start)
{
for(int i = 1; i <= N; i++) d[i] = 0;
d[start] = 1;
queue <int> q;
q.push(start);
while(!q.empty())
{
int nod = q.front(); q.pop();
for(auto nxt: edg[nod])
if(!d[nxt] && cp[nod][nxt] - flw[nod][nxt])
{
d[nxt] = 1 + d[nod];
f[nxt] = nod;
q.push(nxt);
}
}
}
int getFlow(int nod)
{
if(nod == S) return (1 << 30);
int ans = min( cp[ f[nod] ][nod] - flw[ f[nod] ][nod], getFlow(f[nod]) );
return ans;
}
void pushFlow(int nod, int nxt, int flow)
{
flw[nod][nxt] += flow;
flw[nxt][nod] -= flow;
if(nod == S) return;
pushFlow(f[nod], nod, flow);
}
int getMaxFlow(int _S, int _T)
{
S = _S; T = _T;
if(!initGraph) createGraph();
int flow = 0;
bool newFlow = true;
while(newFlow)
{
newFlow = false;
BFS(S);
for(auto nod: edg[T])
if(cp[nod][T] - flw[nod][T])
{
int addFlow = getFlow(nod);
addFlow = min(addFlow, cp[nod][T] - flw[nod][T]);
if(addFlow)
{
pushFlow(nod, T, addFlow);
flow += addFlow;
newFlow = true;
}
}
}
return flow;
}
};
EdmondsKarp maxFlow;
int main()
{
#ifdef FILE_IO
freopen("maxflow.in", "r", stdin);
freopen("maxflow.out", "w", stdout);
#endif
int N, M;
scanf("%d%d", &N, &M);
for(int i = 1; i <= M; i++)
{
int x, y, c;
scanf("%d%d%d", &x, &y, &c);
maxFlow.addEdge(x, y, c);
}
int flow = maxFlow.getMaxFlow(1, N);
printf("%d\n", flow);
return 0;
}