diff --git a/codeforces/B/1433b.cpp b/codeforces/B/1433b.cpp
new file mode 100644
index 0000000..d95f61c
--- /dev/null
+++ b/codeforces/B/1433b.cpp
@@ -0,0 +1,37 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main () {
+
+    int n, size, book;
+    int first, total, zero;
+
+    cin >> n;
+
+    while(n--)
+    {
+        cin >> size;
+
+        first = total = zero = 0;
+
+        while(size--)
+        {
+            cin >> book;
+
+            if(first == 0 && book == 1)
+                first = 1;
+            else if(first == 1 && book == 0)
+                zero++;
+            else if(first == 1 && book == 1)
+            {
+                total += zero;
+                zero = 0;
+            }
+        }
+
+        cout << total << endl;
+    }
+
+    return 0;
+}