Hack
Now
EN
Login
Register
HackNow
$\sum_{i=1}^{N} \phi(i)$ | HackNow
Go back
Reading Mode
bar_chart
Problem
Statistics
send
Total
0
check_circle
AC
0
trending_up
Acceptance
0.0%
timer
Time
0ms
memory
Memory
0.0MB
Problem
Submissions
$\sum_{i=1}^{N} \phi(i)$
lock
UZ only
Oson
100 points
3 s
256 MB
Math Theory
Input format
Output format
Constraints
Examples
1
1
Example #1
Input
5
Output
10
Solution editor
Python 3
Clear
Language
PYTHON
UTF-8
Tab
4 spaces
Ctrl
+
Enter
Submit
Submit
HackNowHackNow