diff --git a/a3/program.c b/a3/program.c
new file mode 100644
index 0000000..33fe447
--- /dev/null
+++ b/a3/program.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+
+int check(int i, int size, int array[])
+{
+    if (i >= size)
+    {
+        return 0;
+    }
+    else if (array[i] < array[(i - 1) / 2])
+    {
+        return 1;
+    }
+    else
+    {
+        return check(i * 2 + 1, size, array) + check(i * 2 + 2, size, array);
+    }
+}
+
+int spaces = 0;
+void print(int i, int size, int array[])
+{
+    if(i >= size)
+    {
+        return;
+    }
+    for(int j = 0; j < spaces; j++)
+    {
+        printf(" ");
+    }
+    printf("%d\n", array[i]);
+    spaces = spaces + 1;
+    print(i * 2 + 1, size, array);
+    print(i * 2 + 2, size, array);
+    spaces = spaces - 1;
+}
+
+int main()
+{
+    int array[1000];
+    int size = 0;
+    while(scanf("%d", &array[size]) != EOF)
+    {
+        size++;
+    }
+    int result = check(0, size, array);
+    if (result == 0)
+    {
+        spaces = 0;
+        printf("Je to taka kopa:\n");
+        print(0, size, array);
+    }
+    else
+    {
+        printf("Nie je kopa.\n");
+        return 0;
+    }
+}
\ No newline at end of file