#include <iostream>
#include <cstdio>
#include <vector>
#define NMAX 1000
#define MMAX 5000
#define INF 550000000

using namespace std;

struct muchie {
  int nod1, nod2, flux, cap;

  muchie(int nnod1 = 0, int nnod2 = 0, int fflux = 0, int ccap = 0) {
    nod1 = nnod1, nod2 = nnod2, flux = fflux, cap = ccap;
  }
};

bool dest;
int n, m, flux_tot, flux;
int inv[2 * MMAX + 5], from[NMAX + 5], mincf[NMAX + 5];
muchie muchii[2 * MMAX + 5];
vector<int> v[NMAX + 5];

void update_flux(int nod, int flux) {
  if(nod == 1)
    return;
  muchie &mfr = muchii[from[nod]], &imfr = muchii[inv[from[nod]]];

  update_flux(mfr.nod1, flux);
  mfr.flux += flux;
  imfr.flux -= flux;
  mincf[nod] = min(mfr.cap - mfr.flux, mincf[mfr.nod1]);
}

void dfs(int nod) {
  muchie mfr = muchii[from[nod]], imfr = muchii[inv[from[nod]]];

  mincf[nod] = min(mfr.cap - mfr.flux, mincf[mfr.nod1]);
  if(nod == n) {
    flux_tot += mincf[n];
    update_flux(n, mincf[n]);
    from[n] = 0;
    dest = true;
    return;
  }
  for(int x: v[nod]) {
    mfr = muchii[x], imfr = muchii[inv[x]];
    if(mfr.cap - mfr.flux == 0 || from[mfr.nod2])
      continue;
    from[mfr.nod2] = x;
    dfs(mfr.nod2);
  }
}

int main() {
  freopen("maxflow.in", "r", stdin);
  freopen("maxflow.out", "w", stdout);
  int a, b, c;

  scanf("%d %d", &n, &m);
  for(int i = 1; i <= m; i++) {
    scanf("%d %d %d", &a, &b, &c);
    muchii[i] = muchie(a, b, 0, c);
    v[a].push_back(i);
  }

  for(int i = 1; i <= m; i++)
    if(!inv[i]) {
      for(int j = i + 1; j <= m; j++)
        if(!inv[j] && muchii[i].nod1 == muchii[j].nod2 && muchii[i].nod2 == muchii[j].nod1) {
          inv[i] = j;
          inv[j] = i;
          break;
        }
      if(!inv[i]) {
        muchii[++m] = muchie(muchii[i].nod2, muchii[i].nod1, 0, 0);
        inv[i] = m;
        inv[m] = i;
        v[muchii[i].nod2].push_back(m);
      }
    }

  flux = 1;
  mincf[0] = INF + 5;
  dest = true;
  muchii[0] = muchie(0, 0, 0, INF + 5);
  while(dest) {
    for(int i = 1; i <= n; i++)
      from[i] = 0;
    dest = false;
    dfs(1);
  }

//  for(int i = 1; i <= n; i++)
//    for(muchie vec: v[i])
//      printf("muchia (%d, %d) are flux %d/%d\n", i, vec.nod, vec.flux, vec.cap);

  printf("%d", flux_tot);

  return 0;
}