include<bits/stdc++.h>

using namespace std; int d=0; int sum=0; typedef struct SB{

int data;
SB*left,*right;

}SBnode,*DSB; void create(DSB & root){

int x;
cin>>x;
if(x==-1){
	root=NULL;
}
else{
	root=new SB;
	root->data=x;
	root->left=NULL;
	root->right=NULL;
	create(root->left);
	create(root->right);
}

} void it(DSB & root,int d){

if(root==NULL){
	return;        
}
d=10*d+root->data;
if(root->left==NULL&&root->right==NULL){
    sum+=d;
}
if(root->left!=NULL){
    it(root->left,d);
}
if(root->right!=NULL){
    it(root->right,d);
}

} int main(){

DSB root;
create(root);
it(root,0);
cout<<sum;
return 0;

}