#include <cstdio>
#include <vector>
using namespace std;
const int N = 1005;
int n, m, S, D;
const int INF = 0x3f3f3f3f;
int c[N][N], f[N][N], t[N];
vector<int> a[N];

int BFS() {
	int i, j, k;
	int cd[1005], v[N];
	for(i = 1; i <= n; ++i)
		t[i] = v[i] = 0;
	cd[0] = 1;
	cd[1] = S;
	v[1] = 1;
	for(i = 1; i <= cd[0]; ++i) {
		k = cd[i];
		for(j = 0; j < a[k].size(); ++j) 
			if(f[k][a[k][j]] < c[k][a[k][j]] && !v[a[k][j]]) {
				cd[++cd[0]] = a[k][j];
				t[a[k][j]] = k;
				v[a[k][j]] = 1;
			}
	}
   return v[D];
}

int main() {
	freopen("maxflow.in", "r", stdin);
	freopen("maxflow.out", "w", stdout);
	int i, j, C, x, y, s[N], d[N];
	scanf("%d %d", &n, &m);
	for(i = 1; i <= m; ++i) 
		scanf("%d %d %d", &x, &y, &C),	c[x][y] = C, a[x].push_back(y),	a[y].push_back(x), s[x] = 1, d[y] =1;
	int flux = 0, r = 0;
	for(i = 1; i <= n; ++i)
		if(d[i] == 0) {
			S = i;
			break;
		}
	for(i = 1; i <= n; ++i)
		if(s[i] == 0) {
			D = i;
			break;
		}
	for(int k = 1;BFS() ; ++k) {
		for(j = 0; j < a[D].size(); ++j){
			if( f[a[D][j]][D] < c[a[D][j]][D]){
				i = D;
				t[D] = a[D][j];
				r = INF;
				while(t[i]) {
					r = min(r, c[t[i]][i] - f[t[i]][i]);
					i = t[i];
				}
		//		printf("%d\n", r); 
				i = D;
				while(t[i]) {
					f[i][t[i]] -= r;
					f[t[i]][i] += r;
					i = t[i];
				}
				flux += r;
			}
		}
	}

	printf("%d\n", flux);

	return 0;
}