// some comma operators practicing
#include <iostream>
using namespace std;

int main() {

// cout << "A simple sum of entered integers: " << endl;
int i, s = 0;
// while (cin >> i, i > 0)
//  s += 1;
s = 0;
while (cin >> i)
s += i;
cout << s << endl;
cin.clear();
// cout << "Cin is cleared: " << endl;

// char ch;
// do cin.get(ch), cout << ch << endl; while (ch != '\n');  


}