diff --git a/boj/1769.py b/boj/1769.py
new file mode 100644
index 0000000..c8e7885
--- /dev/null
+++ b/boj/1769.py
@@ -0,0 +1,17 @@
+n=input()
+count=0
+r=int(n)
+
+while len(n)>1:
+    r=0
+    for i in n:
+        v=int(i)
+        r+=v
+    n=str(r)
+    count+=1
+
+print(count)
+if r%3==0:
+    print("YES")
+else:
+    print("NO")