diff --git a/src/main.c b/src/main.c
index 8447729..5033ada 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,17 @@
 #include<stdlib.h>
 #include<stdio.h>
 
+int fibo(int i) {
+  if (i == 0) return 0;
+  if (i == 1) return 1;
+  if (i == 2) return 2;
+  return fibo(i-1) + fibo(i-2);
+}
+
+
 int main(int argc, char** argv) {
+  int i = 5;
   printf("Hello world !!!\n");
+  printf("compute fibonacci(%i): %i\n", i, fibo(i));
   exit(0);
 }