diff --git a/index.js b/index.js
index 433cdb3..ade04b8 100644
--- a/index.js
+++ b/index.js
@@ -1,39 +1,14 @@
-import { cc } from "bun:ffi";
-import source from "./test.c" with { type: "file" };
+import { dlopen, FFIType, suffix } from "bun:ffi";
 
+const path = `./libfibonacci.so`;
 
-const {
-  symbols: { fibonacci },
-} = cc({
-  source,
-  symbols: {
-    fibonacci: {
-      args: [],
-      returns: "uint64_t",
-    },
+const { symbols } = dlopen(path, {
+  fibonacci_gmp: {
+    args: [],
+    returns: FFIType.cstring,
   },
 });
 
-const risultato = fibonacci();
+const result = symbols.fibonacci_gmp();
+console.log("Fibonacci(25000) =", result);
 
-console.log("fibonacci serie 250 000: ", risultato );
-
-// 
-
-function fibonacci_js() {
-    const n = 250000;
-    let a = 0n;
-    let b = 1n;
-    let c;
-
-    for (let i = 2; i <= n; i++) {
-        c = a + b;
-        a = b;
-        b = c;
-    }
-
-    return b;
-}
-
-const result_js = fibonacci_js();
-console.log("Fibonacci(250 000) =", result_js.toString());
diff --git a/index.js.backup b/index.js.backup
new file mode 100644
index 0000000..0199399
--- /dev/null
+++ b/index.js.backup
@@ -0,0 +1,63 @@
+import { cc } from "bun:ffi";
+import source from "./test.c" with { type: "file" };
+
+
+const {
+  symbols: { fibonacci },
+} = cc({
+  source,
+  symbols: {
+    fibonacci: {
+      args: [],
+      returns: "uint64_t",
+    },
+  },
+});
+
+const risultato = fibonacci();
+
+console.log("fibonacci serie 25 000: ", risultato );
+
+
+
+
+
+
+const {
+  symbols: { fibonacci_gmp },
+} = cc({
+  source,
+  symbols: {
+    fibonacci_gmp: {
+      args: [],
+      returns: "cstring",
+    },
+  },
+});
+
+const result_gmp = fibonacci_gmp();
+console.log("Fibonacci(25000) =", result_gmp);
+
+
+
+
+
+// 
+
+function fibonacci_js() {
+    const n = 25000;
+    let a = 0n;
+    let b = 1n;
+    let c;
+
+    for (let i = 2; i <= n; i++) {
+        c = a + b;
+        a = b;
+        b = c;
+    }
+
+    return b;
+}
+
+const result_js = fibonacci_js();
+console.log("Fibonacci(25 000) =", result_js.toString());
diff --git a/libfibonacci.so b/libfibonacci.so
new file mode 100755
index 0000000..525c72c
Binary files /dev/null and b/libfibonacci.so differ
diff --git a/test.c b/test.c
index 096876a..4682846 100644
--- a/test.c
+++ b/test.c
@@ -1,7 +1,8 @@
 #include <stdint.h>
+#include <gmp.h>
 
 uint64_t fibonacci( void ) {
-    const int n = 250000;
+    const int n = 25000;
     uint64_t a = 0, b = 1, c;
 
     for (int i = 2; i <= n; i++) {
@@ -11,4 +12,30 @@ uint64_t fibonacci( void ) {
     }
 
     return b;
-}
\ No newline at end of file
+}
+
+
+char* fibonacci_gmp() {
+    const int n = 25000;
+    static char result[10000]; // Assicurati che sia abbastanza grande per contenere il numero
+    mpz_t a, b, c;
+    
+    mpz_init_set_ui(a, 0);
+    mpz_init_set_ui(b, 1);
+    mpz_init(c);
+
+    for (int i = 2; i <= n; i++) {
+        mpz_add(c, a, b);
+        mpz_set(a, b);
+        mpz_set(b, c);
+    }
+
+    mpz_get_str(result, 10, b);
+
+    mpz_clear(a);
+    mpz_clear(b);
+    mpz_clear(c);
+
+    return result;
+}
+