#include <stdio.h>
#include <math.h>

#define INF 2000000000

long n, m, C[1024][1024], flux[1024], up[5010], total, Q[5010];

inline long min(long a, long b) {if (a > b) return b; return a;}

void fill(long *v, long cat) {
	for (long i = 1; i <= n; ++i) v[i] = cat;
}

long bfs() {
	fill(flux, 0);
	flux[1] = INF;
	fill(up, -1);
	fill(Q, 0);
	Q[1] = 1;
	long l, r, crt;
	for (l = r = 1; l <= r; l++) {
		crt = Q[l];
		for (long nxt = 1; nxt <= n; ++nxt) {
			if (C[crt][nxt] > 0 && flux[nxt] == 0) {
				Q[++r] = nxt;
				up[nxt] = crt;
				flux[nxt] = min(C[crt][nxt], flux[crt]);
				if (nxt == n) {
					l = r + 1;
					break;
				}
			}
		}
	}
	if (flux[n] == 0) {
		return 0;
	}
	total += flux[n];
	for (long nod = n; nod > 1; nod = up[nod]) {
		C[up[nod]][nod] -= flux[n];
		C[nod][up[nod]] += flux[n];
	}
	return 1;
}

int main() {
	freopen("maxflow.in", "r", stdin);
	freopen("maxflow.out", "w", stdout);
	long i, a, b, c;
	scanf("%ld %ld", &n, &m);
	for (i = 1; i <= m; ++i) {
		scanf("%ld %ld %ld", &a, &b, &c);
		C[a][b] = c;
		C[b][a] = 0;
	}	
	while(bfs());
	printf("%ld\n", total);
	return 0;
}