#include <iostream>
using namespace std;
int main() {
int i1, i2, i3, i4;
// Citim doua numere din input (stdin)
cin >> i1 >> i2 >> i3 >> i4;
// Calculam si afisam suma
cout << (i1 + i2 + i3 +i4) << endl;
return 0;
}
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