first commit

from old repository to a new repository

boj/14916.py

@@ -0,0 +1,11 @@
+n=int(input())
+count=0
+
+while n>0 and not n%5==0:
+	count+=1
+	n-=2
+
+if n>-1 and n%5==0:
+	print((n//5)+count)
+else:
+	print(-1)