#include <iostream>
using namespace std;
int main() {
int a , b, n;
cin >> a >> b >> n;
int copyN = n;
while (copyN) {
if ((a % 2 == 0 && b % 2 == 0 && n % 2 == 0) && copyN > 1) {
//if (copyN == 1) {
// cout << b << "<";
//} else {
cout << a;
//}
} else if ((a % 2 == 0 && b % 2 == 0 && n % 2 == 0) && copyN == 1){
cout << b;
}else if ((a % 2 != 0 || b % 2 != 0 || n % 2 != 0)) {
cout << (a + n) / 3 ;
}
--copyN;
}
cout <<"\n>>" << (9+9+9+9+9+9+9+9+9) / 9 ;
return 0;
}
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