first commit

from old repository to a new repository

boj/2839.py

@@ -0,0 +1,16 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+res=0
+
+while n>0:
+    if n%5==0:
+        res+=n//5
+        break
+    n-=3
+    res+=1
+
+    if n==1 or n==2:
+        res=-1
+        break
+    
+print(res)