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// 0; 0.
#include <iostream>
using namespace std;
int main() {
	bool sz = false;
	int f;
	int e = 0;
	while (1) {
		cin >> f;
		e += f;
		if (f == 0 && sz == 1) {
			break;
		}
		if (f == 0 && sz == 0) {
			sz = 1;
		}
		if (f != 0) {
			sz = 0;
		}
	}
	cout << e;
	return 0;
}