diff --git a/a4/program.c b/a4/program.c
new file mode 100644
index 0000000..899e543
--- /dev/null
+++ b/a4/program.c
@@ -0,0 +1,34 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+int is_heap(int* arr, int size ){
+    for(int i = 0; i < size; i++){
+        int l = i * 2 + 1;
+        int r = i * 2 + 2;
+    }
+    
+    if (left < size && arr[i] < arr[left]){
+        return 0;
+    }
+    
+    if (right < size && arr[i] < arr[right]){
+        return 0;
+    }
+    return 1;
+}
+
+int main() {
+    int arr[] = 100; 
+    int size = 0;
+    
+    while (scanf("%d", &num) != EOF){
+        arr[size++] = num;
+    }
+    
+    if (!is_heap(arr, size)){
+        printf("Nie je kopa.");
+    }
+    
+    return 0;
+}
+