include <iostream>

include <cmath>

using namespace std;

int main () { long n, m = 0, cem; while (cin >> n && n != 0) { if (n >0) cem=cem+n; } cout << cem; }//zed botumdu olacaqda

include <iostream>

include <cmath>

using namespace std;

int main () { long n, m = 0, cem; while (cin >> n && n != 0) { if (n >0) cem=cem+n; } cout << cem; }//zed botumdu olacaqda

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include <iostream>

include <cmath>

using namespace std;

int main () { long n, m = 0, cem; while (cin >> n && n != 0) { if (n > 0) cem = cem + n; } cout << cem; } //Ayxan113>Thebestone_me