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- #include <iostream>
- using namespace std;
- int product(int a, int b) {
- if(b == 0) {
- return 0;
- }
- return a + product(a, b - 1);
- }
- int main()
- {
- int a, b;
- cin >> a >> b;
- cout << product(a, b) << endl;
- return 0;
- }
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