diff --git a/asdzes2zad1eratostenes/.gitignore b/asdzes2zad1i2eratostenes_mersenne/.gitignore
similarity index 100%
rename from asdzes2zad1eratostenes/.gitignore
rename to asdzes2zad1i2eratostenes_mersenne/.gitignore
diff --git a/asdzes2zad1eratostenes/asdzes2zad1eratostenes.pro b/asdzes2zad1i2eratostenes_mersenne/asdzes2zad1i2eratostenes_mersenne.pro
similarity index 100%
rename from asdzes2zad1eratostenes/asdzes2zad1eratostenes.pro
rename to asdzes2zad1i2eratostenes_mersenne/asdzes2zad1i2eratostenes_mersenne.pro
diff --git a/asdzes2zad1eratostenes/main.c b/asdzes2zad1i2eratostenes_mersenne/main.c
similarity index 89%
rename from asdzes2zad1eratostenes/main.c
rename to asdzes2zad1i2eratostenes_mersenne/main.c
index 22e01b7..a43db00 100644
--- a/asdzes2zad1eratostenes/main.c
+++ b/asdzes2zad1i2eratostenes_mersenne/main.c
@@ -43,7 +43,7 @@ void doSE()
 
 #define FILL_CHAR '-'
 
-int main()
+void do_and_print_eratostenes()
 {
     doSE();
     int i;
@@ -66,5 +66,15 @@ int main()
         }
     }
     putchar('\n');
+}
+
+void do_and_print_mersenne()
+{
+}
+
+int main()
+{
+    do_and_print_eratostenes();
+    do_and_print_mersenne();
     return 0;
 }