#include <fstream>
#define NMAX 1001
using namespace std;
int n,m,F[NMAX][NMAX],C[NMAX][NMAX],flux,x,y,r;
int T[NMAX],q[NMAX];
ifstream f("maxflow.in");
ofstream g("maxflow.out");
int BF()
{
    int i,k,p,u;
    p=u=0;
    for(i=1;i<=n;i++)
        T[i]=0;
    q[0]=1;
    T[1]=-1;
    for(;p<=u;p++)
    {
        k=q[p];
        for(i=1;i<=n;i++)
            if(!T[i]&&C[k][i]>F[k][i])
            {
                q[++u]=i;
                T[i]=k;
                if(i==n)return 1;
            }
    }
    return 0;
}
int main()
{
    f>>n>>m;
    int i,j;
    for(i=1;i<=m;i++)
    {
        f>>x>>y;
        f>>C[x][y];
    }
    while(BF())
        for(i=1;i<=n;i++)
        {
            if(T[i]==-1||C[i][n]<=F[i][n])continue;
            r=C[i][n]-F[i][n];
            for(j=i;j!=1&&j;j=T[j])
                r=min(r,C[T[j]][j]-F[T[j]][j]);
            if(r==0)continue;
            F[i][n]+=r;
            F[n][i]-=r;
            for(j=i;j!=1;j=T[j])
            {
                F[T[j]][j]+=r;
                F[j][T[j]]-=r;
            }
            flux+=r;
        }
    g<<flux;
    return 0;
}