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// 2 #include <iostream> using namespace std; int main() { int a; cin >> a; int f = 0; while (a != 0) { if ((a % 10) % 2 == 0) { f += 1; a /= 10; } if ((a % 10) % 2 != 0) { a /= 10; } } cout << f; return 0; }