int u[3d3],v[3d3],l[3d3],x[3d3];

struct Node {
	int parent;
	int depth;
	ll cost;
};

Node nodes[3d3];
int visited[3d3];
ll saveds[3d3];
int steps[10000000],fs[10000000];
int stepn;

ll totalcost;
ll totalsaved;

wgraph<int> g;
HLD h;

void f1(int i,int p){
	rep(k,g.es[i]){
		int j=g.edge[i][k];
		if(j!=p){
			nodes[j].parent=i;
			nodes[j].depth=nodes[i].depth+1;
			nodes[j].cost=g.cost[i][k];
			f1(j,i);
		}
	}
}

{
	int @n,@q,@c;
	rd((u--,v--,l)(n-1));
	rd((x--)(q));
	g.setEdge(n,n-1,u,v,l);
	h.init(g.g);
	f1(0,-1);
	{
		int p=x[0];
		steps[stepn++]=p;
		rep(k,q){
			int y=x[k];
			int a=h.lca(p,y);
			while(p!=a){
				p=nodes[p].parent;
				steps[stepn++]=p;
			}
			stepn+=nodes[y].depth-nodes[a].depth;
			int n=stepn;
			while(y!=a){
				steps[--n]=y;
				y=nodes[y].parent;
			}
			p=x[k];
			fs[stepn-1]=1;
		}
	}
	
	{
		int p=steps[0];
		visited[p]=1;
		ll saved=0;
		rep(stepi,1,stepn){
			int y=steps[stepi];
			int localcost=(nodes[y].parent==p?nodes[y].cost:nodes[p].cost);
			saved+=localcost;
			totalcost+=localcost;
			if(visited[y]){
				if(totalsaved<saveds[y]+saved-c){
					totalsaved=saveds[y]+saved-c;
				}
			}
			visited[y]=1;
			if(fs[stepi]){
				saved=0;
			}
			saveds[y]=totalsaved;
			p=y;
		}
	}
	wt(totalcost-totalsaved);
}