How to show interstitial ad in webview after some interval or 3-4 click?

Question

I have a wordpress website and of which I have a webview app and I have implemented interstitial ad on any button click, so whenever a link is clicked full page ads gets shown, How do I decrease it's frequency, I want it to come well let's say after 3 or 4 click?

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            // The webView is about to navigate to the specified url.
            // Toast.makeText(MainActivity.this, "Login clicked", Toast.LENGTH_LONG).show();
            if (interstitialAd.isLoaded()) {
                interstitialAd.show();
                interstitialAd.setAdListener(new AdListener() {
                    @Override
                    public void onAdClosed() {
                        AdRequest adRequest = new AdRequest.Builder()
                                .build();
                        interstitialAd.loadAd(adRequest);
                    }
                });
            }
            return super.shouldOverrideUrlLoading(view, url);
        }

Answer 1

Final solution to my problem, any suggestion most welcome...

int n = 1;
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                // The webView is about to navigate to the specified url.

                if (interstitialAd.isLoaded()) {
                    if( n%3 == 0 )
                    {
                        interstitialAd.show();

           } n++;
                }
                interstitialAd.setAdListener(new AdListener() {
                    @Override
                    public void onAdClosed() {
                        AdRequest adRequest = new AdRequest.Builder()
                                .build();
                        interstitialAd.loadAd(adRequest);
                    }
                });
                return super.shouldOverrideUrlLoading(view, url);
            }