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#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll dfs(int u)
{
	if(son[u]==0)
		return value[u];
	if(son[u]==1)
		return (value[u]+dfs(v))>>1;
	if(son[u]>1)
	{
		ll minn=MAX_LONG_LONG;
		for(v|u->v)
		{
			minn=min(dfs(v),minn);
		}
		return minn;
	}
}
int main()
{
	cout<<value[1]+dfs(1)<<endl;
	return 0;
}