diff --git a/helper.c b/helper.c
new file mode 100644
index 0000000..cef6815
--- /dev/null
+++ b/helper.c
@@ -0,0 +1,25 @@
+#include <stdint.h>
+#include <stdio.h>
+
+void print_uint128(unsigned __int128 n) {
+    if (n == 0) {
+        printf("0\n");
+        return;
+    }
+
+    // A 128-bit number can have up to 39 decimal digits
+    char buffer[40];
+    int i = 0;
+
+    // Extract digits from right to left
+    while (n > 0) {
+        buffer[i++] = (n % 10) + '0'; // Convert math digit to character
+        n /= 10;
+    }
+
+    // Print them in reverse order (left to right)
+    while (i > 0) {
+        putchar(buffer[--i]);
+    }
+    putchar('\n');
+}
diff --git a/main.c b/main.c
index 5e21610..431772d 100644
--- a/main.c
+++ b/main.c
@@ -4,6 +4,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "helper.c"
+
 uint64_t *dec_to_bin(uint64_t d, uint64_t *length) {
     uint64_t *binary_form = calloc(100, sizeof(uint64_t));
     int index = 0;
@@ -15,11 +17,6 @@ uint64_t *dec_to_bin(uint64_t d, uint64_t *length) {
 
     *length = index;
 
-    for (int i = index; i >= 0; i--) {
-        printf("%ju", binary_form[i]);
-    }
-    printf(" index: %d\n", index);
-
     return binary_form;
 }
 
@@ -66,10 +63,7 @@ bool prime_test(uint64_t n, int a) {
     while (d % 2 == 0) {
         d = d / 2;
         S++;
-        printf("%ju ", d);
     }
-    printf("S: %ju", S);
-    printf("\n");
 
     uint64_t r = S - 1; // this stores the number of elements from 0 to S-1
 
@@ -81,7 +75,6 @@ bool prime_test(uint64_t n, int a) {
 
     if ((first_qp_res = quick_pow(d_binary, a, n, length)) == 1) {
         free(d_binary);
-        printf("true\n");
         return true;
     }
 
@@ -98,7 +91,6 @@ bool prime_test(uint64_t n, int a) {
         }
     }
 
-    printf("\nfalse\n\n");
     free(d_binary);
     return false;
 }
@@ -111,5 +103,25 @@ int main() {
     prime_test(661, 2);
     prime_test(18446744073709551557UL, 2);
     prime_test(18446744073709551533UL, 3);
+
+    uint64_t p = 11;
+    uint64_t q = 29;
+
+    // probably i should generate instead of asking the user to input
+    if (!prime_test(p, 2) || !prime_test(q, 2)) {
+        printf("given numbers were not primes");
+        return 1;
+    }
+
+    printf("\n");
+
+    unsigned __int128 n = p * q;
+    print_uint128(n);
+    printf("\n");
+
+    unsigned __int128 fi_n = (p - 1) * (q - 1);
+    print_uint128(fi_n);
+    printf("\n");
+
     return 0;
 }