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    Here is my c++ solution, you can watch the explanation here : https://youtu.be/SbHCdf_c7ss

    int viralAdvertising(int n) {
        int ans = 0, shared = 5;
        for(int i = 1; i <= n; i++){
            ans += shared / 2;
            shared = (shared/2)*3;
        }
        return ans;
    }