diff --git a/15_lattice_paths/main.go b/15_lattice_paths/main.go
new file mode 100644
index 0000000..9f910fa
--- /dev/null
+++ b/15_lattice_paths/main.go
@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("num is", (40*39*38*37*36*35*34*33*32*31*30*29*28*27*26*25*24*23*22*21)/(20*19*18*17*16*15*14*13*12*11*10*9*8*7*6*5*4*3*2*1))
+}