#include <bits/stdc++.h>
 
//    #include <boost/multiprecision/cpp_int.hpp>
// #define int long long
 #define inf  1000000007
 #define pa pair<int,int>
 #define ll long long
 #define pal pair<double,double>
 #define ppap pair<pa,int>
  #define PI 3.14159265358979323846
  #define paa pair<int,char>
  #define  mp make_pair
  #define  pb push_back
  #define EPS (1e-8)
                                          
    int dx[8]={0,1,0,-1,1,1,-1,-1};
    int dy[8]={1,0,-1,0,-1,1,1,-1};
                                            using namespace std;
                                   			class pa3{
                                            	public:
                                            	int x;
                                   				int y,z;
                                            	pa3(int x=0,int y=0,int z=0):x(x),y(y),z(z) {}
                                            	bool operator < (const pa3 &p) const{
                                            		if(x!=p.x) return x<p.x;
                                            		if(y!=p.y) return y<p.y;
                                            		 return z<p.z;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                   				bool operator > (const pa3 &p) const{
                                            		if(x!=p.x) return x>p.x;
                                            		if(y!=p.y) return y>p.y;
                                            		 return z>p.z;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator == (const pa3 &p) const{
                                            		return x==p.x && y==p.y && z==p.z;
                                            	}
                                            		bool operator != (const pa3 &p) const{
                                            			return !( x==p.x && y==p.y && z==p.z);
                                            	}
                                            
                                            };
                                            
                                            class pa4{
                                            	public:
                                            	int x;
                                            	int y,z,w;
                                            	pa4(int x=0,int y=0,int z=0,int w=0):x(x),y(y),z(z),w(w) {}
                                            	bool operator < (const pa4 &p) const{
                                            		if(x!=p.x) return x<p.x;
                                            		if(y!=p.y) return y<p.y;
                                            		if(z!=p.z)return z<p.z;
                                            		return w<p.w;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator > (const pa4 &p) const{
                                            		if(x!=p.x) return x>p.x;
                                            		if(y!=p.y) return y>p.y;
                                            		if(z!=p.z)return z>p.z;
                                            		return w>p.w;
                                            		//return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator == (const pa4 &p) const{
                                            		return x==p.x && y==p.y && z==p.z &&w==p.w;
                                            	}
                                            		
                                            
                                            };
                                            class pa2{
                                            	public:
                                            	int x,y;
                                            	pa2(int x=0,int y=0):x(x),y(y) {}
                                            	pa2 operator + (pa2 p) {return pa2(x+p.x,y+p.y);}
                                            	pa2 operator - (pa2 p) {return pa2(x-p.x,y-p.y);}
                                            	bool operator < (const pa2 &p) const{
                                            		return y != p.y ? y<p.y: x<p.x;
                                            	}
                                            	bool operator > (const pa2 &p) const{
                                            		return x != p.x ? x<p.x: y<p.y;
                                            	}
                                            	bool operator == (const pa2 &p) const{
                                            		return abs(x-p.x)==0 && abs(y-p.y)==0;
                                            	}
                                            	bool operator != (const pa2 &p) const{
                                            		return !(abs(x-p.x)==0 && abs(y-p.y)==0);
                                            	}
                                            		
                                            
                                            };
                                            
 
                      
                                string itos( int i ) {
                                ostringstream s ;
                                s << i ;
                                return s.str() ;
                                }
                                 
                                int gcd(int v,int b){
                                	if(v==0) return b;
                                	if(b==0) return v;
                                	if(v>b) return gcd(b,v);
                                	if(v==b) return b;
                                	if(b%v==0) return v;
                                	return gcd(v,b%v);
                                }
                 
                            
                                int mod;
int extgcd(int a, int b, int &x, int &y) {
    if (b == 0) {
        x = 1;
        y = 0;
        return a;
    }
    int d = extgcd(b, a%b, y, x);
    y -= a/b * x;
    return d;
}
pa operator+(const pa & l,const pa & r) {   
    return {l.first+r.first,l.second+r.second};                                    
}    
pa operator-(const pa & l,const pa & r) {   
    return {l.first-r.first,l.second-r.second};                                    
}  
              /*                  
                int pr[700100];
                int inv[700010];
                
                int beki(int wa,int rr,int warukazu){
                	if(rr==0) return 1%warukazu;
                	if(rr==1) return wa%warukazu;
                	wa%=warukazu;
                	if(rr%2==1) return ((ll)beki(wa,rr-1,warukazu)*(ll)wa)%warukazu;
                	ll zx=beki(wa,rr/2,warukazu);
                	return (zx*zx)%warukazu;
                }
 
                
    			int comb(int nn,int rr){
    				if(rr<0 || rr>nn || nn<0) return 0;
    				int r=pr[nn]*inv[rr];
    				r%=mod;
    				r*=inv[nn-rr];
    				r%=mod;
    				return r;
    			}
               
                void gya(int ert){
                	pr[0]=1;
                	for(int i=1;i<=ert;i++){
                		pr[i]=((ll)pr[i-1]*i)%mod;
                	}
                		inv[ert]=beki(pr[ert],mod-2,mod);
                	for(int i=ert-1;i>=0;i--){
                		inv[i]=(ll)inv[i+1]*(i+1)%mod;
                	}
                }
                */
              //   cin.tie(0);
    		//	ios::sync_with_stdio(false);
    			//priority_queue<pa3,vector<pa3>,greater<pa3>> pq;            
                 //sort(ve.begin(),ve.end(),greater<int>());
 //   mt19937(clock_per_sec);
  //  mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()) ;


struct edge{
	int to,cap,num,moto;
};

struct push_relabel{
	
	int n;
	vector<vector<edge>>ZANYO;
	vector<vector<int>> active;
	vector<int> excess;
	vector<int> label,pos;
	
	void shoki(int N){
		n=N;
		ZANYO.resize(n,vector<edge>());
		active.resize(2*n+10,vector<int>());
		excess.resize(n,0);
		label.resize(n,0);
		pos.resize(n,0);
	}
	
	void add_edge(int s_point,int t_point, int capa){ // s!=t 0<=s,t<n cap>=0
		ZANYO[s_point].pb((edge){t_point,capa,(int)ZANYO[t_point].size(),0});
		ZANYO[t_point].pb((edge){s_point,0,(int)ZANYO[s_point].size()-1,1});
	}
	
	int max_flow(int s,int t){
		
		// first preflow
		for(auto &v:ZANYO[s])if(v.moto==0){
			excess[s]-=v.cap;
			excess[v.to]+=v.cap;
			ZANYO[v.to][v.num].cap=v.cap;
			v.cap=0;
		}
		
		// first label;
		label[s]=n;
		
		for(int i=0;i<n;i++)if(i!=s&&i!=t)if(excess[i]>0)active[0].pb(i);
		
		int max_label=0;
		int cnt=0;
		while(1){
			cnt++;
		//	if(cnt>50)break;
			/*
			for(int i=0;i<n;i++)cout<<excess[i]<<" ";
			cout<<endl;
			for(int i=0;i<n;i++)cout<<label[i]<<" ";
			cout<<endl;
			*/
			
			while(active[max_label].size()==0){
				max_label--;
				if(max_label<0)break;
			}
			if(max_label<0)break;
			bool owari=0;
			int u=active[max_label].back();
			
			for(;pos[u]<ZANYO[u].size();pos[u]++){
				edge v=ZANYO[u][pos[u]];
				if(v.cap==0)continue;
				assert(label[v.to]>=label[u]-1);
				if(label[v.to]>=label[u])continue;
				if(excess[u]>v.cap){
					ZANYO[v.to][v.num].cap+=v.cap;
					ZANYO[u][pos[u]].cap=0;
					if(excess[v.to]==0 && v.to!=s&&v.to!=t){
						active[label[v.to]].pb(v.to);
					}
					excess[v.to]+=v.cap;
					excess[u]-=v.cap;
				}
				else{
					ZANYO[v.to][v.num].cap+=excess[u];
					ZANYO[u][pos[u]].cap-=excess[u];
					
					if(excess[v.to]==0 && v.to!=s&&v.to!=t){
						active[label[v.to]].pb(v.to);
					}
					excess[v.to]+=excess[u];
					excess[u]=0;
					active[max_label].pop_back();
					owari=1;
					break;
				}
				
			}
			if(owari)continue;
			
			// relabel
			int w=5*n;
			for(auto v:ZANYO[u])if(v.cap>0)w=min(w,label[v.to]);
			assert(w<5*n);
			active[max_label].pop_back();
			max_label=w+1;
			//cout<<max_label<<endl;
			active[max_label].pb(u);
			label[u]=max_label;
			pos[u]=0;
		}
		return excess[t];
		
	}
	
	void fukugen(){
		for(int i=0;i<n;i++)for(auto v:ZANYO[i])if(v.moto==1){
			cout<<v.to<<" "<<i<<" "<<v.cap<<endl;
		}
	}
};




signed main(){
cin.tie(0);
ios::sync_with_stdio(false);

push_relabel ss;
	int n,m;
	cin>>n>>m;
	ss.shoki(n);
	for(int i=0;i<m;i++){
		int y,yy,yyy;
		cin>>y>>yy>>yyy;
		ss.add_edge(y,yy,yyy);
	}
	cout<<ss.max_flow(0,n-1)<<endl;
return 0;
 }



Measured memory_bytes: 3284