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#include <iostream> using namespace std; int rek(int x) { if(x == 0) { return 0; } int cifra = x % 10; if(cifra % 2 == 0) { return rek(x / 10) + cifra; } else { return rek(x / 10); } } int main() { int n; cin >> n; cout << rek(n) << endl; return 0; } /* rek(1234) = rek(123) + 4 = 2 + 4 = 6 rek(123) = rek(12) = 2 rek(12) = rek(1) + 2 = 0 + 2 = 2 rek(1) = rek(0) = 0 rek(0) = 0 **/
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