diff --git a/examples/B28.s b/examples/B28.s
new file mode 100644
index 0000000000000000000000000000000000000000..cfafd3292fe4f31c932372b2287c4d50a48ce3fe
--- /dev/null
+++ b/examples/B28.s
@@ -0,0 +1,10 @@
+MOV R3 12               ; N = 12
+MOV R2 1                ;
+MOV R1 0                ; i = 0;
+MOV R0 1                ; n = 1;
+M0V R4 0            ; while(i != N)
+JZ  R4 11               ; {
+ADD R1 R1 R2            ;   i = i + 1;
+MUL R0 R0 R1            ;   n = n * i;
+JMP 2                  ; }
+RET R0                  ; return n;