void shader::fill_array_values(gpr_array *a, vvec &vv) {
unsigned sz = a->array_size;
vv.resize(sz);
for (unsigned i = 0; i < a->array_size; ++i) {
vv[i] = get_gpr_value(true, a->base_gpr.sel() + i, a->base_gpr.chan(),
false);
}
}
int main(){
int i, u, v;
cin>>n;
rel.resize(n+2);
for( i=1 ; i<n ; i++ ){
cin>>u>>v;
rel[u].pb(v);
rel[v].pb(u);
}
total_sum = 0;
for( i=1 ; i<=n ; i++ ){
cin>>c[i];
total_sum += c[i];
vis[i] = 0;
}
visited = 0;
ans = -1;
par[1] = 1;
int cc = dfs(1);
if( ans != -1 ){
cout<<"YES\n";
cout<<ans<<"\n";
}
else{
cout<<"NO\n";
}
return 0;
}