#include <iostream>
#include <vector>
using namespace std;
 
int sum(vector<int> arr){
	if(!arr.size()){
		return 0;
	}
	auto back=arr.back();
	arr.pop_back();
	return back+sum(arr);
}
 
int main() {
	vector<int> sample;
	int Number;
	while(cin>>Number) sample.push_back(Number);
	cout<<sum(sample);
	// your code goes here
	return 0;
}

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